<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:205c3a0f-8b5c-42ef-952b-ee3d7243d566,g:def1d11f-4c5f-4a20-ad50-66cc0da846cc-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.federalrealty.com/role/CoverPage" xlink:type="simple" xlink:href="frt-20221231.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/CoverPage" xlink:type="extended" id="i624357ff11e341338bcac9dc8f2a174b_CoverPage">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_e6ec9fde-83f5-4c59-b744-2309ceda5357" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_DocumentAnnualReport_e6ec9fde-83f5-4c59-b744-2309ceda5357" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_c8d87043-eae1-4643-a0a5-d467bb6a2aa3" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_DocumentTransitionReport_c8d87043-eae1-4643-a0a5-d467bb6a2aa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_1326c1f2-7eca-4d02-a2df-c87dcefc50ed" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityFileNumber_1326c1f2-7eca-4d02-a2df-c87dcefc50ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_8eb1e047-4ff1-474d-ba7b-b8a7c64a2519" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityRegistrantName_8eb1e047-4ff1-474d-ba7b-b8a7c64a2519" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_8391bb3b-d62f-49ec-970f-da0e963b9842" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityIncorporationStateCountryCode_8391bb3b-d62f-49ec-970f-da0e963b9842" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_aee3df6e-bb6c-4ff8-8412-bb48e6cc9cb4" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityTaxIdentificationNumber_aee3df6e-bb6c-4ff8-8412-bb48e6cc9cb4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_5fcc42d2-dcbd-4c2c-b001-dc55d6b592dc" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityAddressAddressLine1_5fcc42d2-dcbd-4c2c-b001-dc55d6b592dc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_4736f0a1-107f-4136-94a4-14190880744b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityAddressCityOrTown_4736f0a1-107f-4136-94a4-14190880744b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_0c80814d-4413-44be-b552-f5f4e1775684" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityAddressStateOrProvince_0c80814d-4413-44be-b552-f5f4e1775684" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_31d049d2-fa90-44d9-b43d-e1a0f9e17d95" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityAddressPostalZipCode_31d049d2-fa90-44d9-b43d-e1a0f9e17d95" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_23a6c1ba-ce77-4ceb-ab3c-3d5147ed1e58" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_CityAreaCode_23a6c1ba-ce77-4ceb-ab3c-3d5147ed1e58" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_a524e34a-4f33-4622-9d75-707694070010" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_LocalPhoneNumber_a524e34a-4f33-4622-9d75-707694070010" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_08641fe4-9c93-42c4-950b-0ac2e3c54fb8" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_Security12bTitle_08641fe4-9c93-42c4-950b-0ac2e3c54fb8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_8e28171c-5034-4c49-b934-16f684b7e902" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_TradingSymbol_8e28171c-5034-4c49-b934-16f684b7e902" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_550ba2fc-3e59-4865-8bee-5b274b72eedf" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_SecurityExchangeName_550ba2fc-3e59-4865-8bee-5b274b72eedf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_6e6cda99-6dd4-4611-9ac0-68b323848a6f" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_6e6cda99-6dd4-4611-9ac0-68b323848a6f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers_8a90501d-22c3-4e98-bb8b-d12a6392118b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityVoluntaryFilers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityVoluntaryFilers_8a90501d-22c3-4e98-bb8b-d12a6392118b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_ae2ad475-40c2-432a-904f-1ce6cc89554f" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityCurrentReportingStatus_ae2ad475-40c2-432a-904f-1ce6cc89554f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_27f0b87f-342d-4776-aa55-c2a49eb1c160" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityInteractiveDataCurrent_27f0b87f-342d-4776-aa55-c2a49eb1c160" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_e9d14bc3-470b-4cc3-9def-23d5541f29db" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityFilerCategory_e9d14bc3-470b-4cc3-9def-23d5541f29db" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_a2e91b11-e19e-4eaa-958f-4fd38f2b0e8a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntitySmallBusiness_a2e91b11-e19e-4eaa-958f-4fd38f2b0e8a" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_fdf09de9-bcdb-4315-8485-54fb537d87c8" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityEmergingGrowthCompany_fdf09de9-bcdb-4315-8485-54fb537d87c8" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag_0bed4290-8cfc-434a-acbc-c6fc5c28a54d" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_IcfrAuditorAttestationFlag_0bed4290-8cfc-434a-acbc-c6fc5c28a54d" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_c98ad430-4098-4b1b-9064-f78a7913726e" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityShellCompany_c98ad430-4098-4b1b-9064-f78a7913726e" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityPublicFloat_18648dbc-6eda-49f6-880f-144245a36172" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityPublicFloat"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityPublicFloat_18648dbc-6eda-49f6-880f-144245a36172" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_aa5df327-cb56-422d-ac1d-2b78d19c5b4f" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_aa5df327-cb56-422d-ac1d-2b78d19c5b4f" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_fc1dfc7d-84ca-4ce4-911a-149662f5d3b1" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntityCentralIndexKey_fc1dfc7d-84ca-4ce4-911a-149662f5d3b1" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_8a61adbc-0164-4890-bf4c-5ebec26d7488" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_DocumentFiscalYearFocus_8a61adbc-0164-4890-bf4c-5ebec26d7488" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_a02a1c5b-c93b-4cb2-b12f-53b01ced5ed9" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_DocumentFiscalPeriodFocus_a02a1c5b-c93b-4cb2-b12f-53b01ced5ed9" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_e762ad12-2900-4591-804f-3aba927d06f2" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_AmendmentFlag_e762ad12-2900-4591-804f-3aba927d06f2" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag_227de782-4788-4e67-b7b8-9a1af1f05ff4" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_NoTradingSymbolFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_NoTradingSymbolFlag_227de782-4788-4e67-b7b8-9a1af1f05ff4" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_3ec66699-86bd-405a-8b2f-42565ca2f454" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_DocumentPeriodEndDate_3ec66699-86bd-405a-8b2f-42565ca2f454" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_b13061a6-12ea-4ce2-9e60-5cce2cef7762" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_CurrentFiscalYearEndDate_b13061a6-12ea-4ce2-9e60-5cce2cef7762" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_5d502c14-836b-4444-bcc0-077058d77daa" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_DocumentType_5d502c14-836b-4444-bcc0-077058d77daa" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_8412f691-6735-4605-9a59-0ed2ee94ae8a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_4ca34705-b236-4d82-baa8-6d9c4f0b7567" xlink:to="loc_dei_EntitiesTable_8412f691-6735-4605-9a59-0ed2ee94ae8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsExchangeAxis_4bc2b8e1-b5af-4388-a0bb-bb85f7cd8374" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityListingsExchangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_8412f691-6735-4605-9a59-0ed2ee94ae8a" xlink:to="loc_dei_EntityListingsExchangeAxis_4bc2b8e1-b5af-4388-a0bb-bb85f7cd8374" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_4bc2b8e1-b5af-4388-a0bb-bb85f7cd8374_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityListingsExchangeAxis_4bc2b8e1-b5af-4388-a0bb-bb85f7cd8374" xlink:to="loc_dei_ExchangeDomain_4bc2b8e1-b5af-4388-a0bb-bb85f7cd8374_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_309c6aff-53ac-43e4-9f9a-80b992ade109" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityListingsExchangeAxis_4bc2b8e1-b5af-4388-a0bb-bb85f7cd8374" xlink:to="loc_dei_ExchangeDomain_309c6aff-53ac-43e4-9f9a-80b992ade109" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XNYS_17638ae8-4786-4e5c-8283-5b500412a3ca" xlink:href="https://xbrl.sec.gov/exch/2022/exch-2022.xsd#exch_XNYS"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_309c6aff-53ac-43e4-9f9a-80b992ade109" xlink:to="loc_exch_XNYS_17638ae8-4786-4e5c-8283-5b500412a3ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_02f4a06d-655b-40e2-b345-44c92baa301e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_8412f691-6735-4605-9a59-0ed2ee94ae8a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_02f4a06d-655b-40e2-b345-44c92baa301e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_02f4a06d-655b-40e2-b345-44c92baa301e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_02f4a06d-655b-40e2-b345-44c92baa301e" xlink:to="loc_us-gaap_ClassOfStockDomain_02f4a06d-655b-40e2-b345-44c92baa301e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_35db813c-c8fe-4ff2-997e-bff5b93d7a99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_02f4a06d-655b-40e2-b345-44c92baa301e" xlink:to="loc_us-gaap_ClassOfStockDomain_35db813c-c8fe-4ff2-997e-bff5b93d7a99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonSharesOfBeneficialInterestMember_bc3e15b5-acf5-42b9-96f0-9971b05daabd" xlink:href="frt-20221231.xsd#frt_CommonSharesOfBeneficialInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_35db813c-c8fe-4ff2-997e-bff5b93d7a99" xlink:to="loc_frt_CommonSharesOfBeneficialInterestMember_bc3e15b5-acf5-42b9-96f0-9971b05daabd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DepositorySharesMember_fb396df5-e66b-4fdb-9b5d-82130f8c1ec9" xlink:href="frt-20221231.xsd#frt_DepositorySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_35db813c-c8fe-4ff2-997e-bff5b93d7a99" xlink:to="loc_frt_DepositorySharesMember_fb396df5-e66b-4fdb-9b5d-82130f8c1ec9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e80af329-83c0-4f6f-889d-ae27e5d33990" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_8412f691-6735-4605-9a59-0ed2ee94ae8a" xlink:to="loc_dei_LegalEntityAxis_e80af329-83c0-4f6f-889d-ae27e5d33990" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e80af329-83c0-4f6f-889d-ae27e5d33990_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_e80af329-83c0-4f6f-889d-ae27e5d33990" xlink:to="loc_dei_EntityDomain_e80af329-83c0-4f6f-889d-ae27e5d33990_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_b05d38c0-f4ad-4690-9e8a-04e79e3719b9" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_e80af329-83c0-4f6f-889d-ae27e5d33990" xlink:to="loc_dei_EntityDomain_b05d38c0-f4ad-4690-9e8a-04e79e3719b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FederalRealtyOPLPMember_71eb64f9-2b54-4eee-b1c1-1425b8509b00" xlink:href="frt-20221231.xsd#frt_FederalRealtyOPLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_b05d38c0-f4ad-4690-9e8a-04e79e3719b9" xlink:to="loc_frt_FederalRealtyOPLPMember_71eb64f9-2b54-4eee-b1c1-1425b8509b00" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="frt-20221231.xsd#ConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedBalanceSheets" xlink:type="extended" id="i27042043626245aabeb16c43f7f4b307_ConsolidatedBalanceSheets">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RentalProperties_03405269-b33f-49a1-b094-1b7c0deb7e35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RentalProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_RentalProperties_03405269-b33f-49a1-b094-1b7c0deb7e35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressGross_56156c45-d569-4344-be6b-6fd3119480e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConstructionInProgressGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_ConstructionInProgressGross_56156c45-d569-4344-be6b-6fd3119480e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAtCost_4a54def4-65a7-49eb-8178-c26a66dabd0a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateInvestmentPropertyAtCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyAtCost_4a54def4-65a7-49eb-8178-c26a66dabd0a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_7e0835e6-90ac-4a8b-83d2-1c42b3e4d442" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_7e0835e6-90ac-4a8b-83d2-1c42b3e4d442" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyNet_5a3b61e3-8c2e-4fa3-a1c4-5ab775ebe1ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateInvestmentPropertyNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyNet_5a3b61e3-8c2e-4fa3-a1c4-5ab775ebe1ce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0551afa4-10dd-46ec-8dd8-f87dea43e830" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_0551afa4-10dd-46ec-8dd8-f87dea43e830" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndNotesReceivableNet_180c65ff-02b7-4aac-895b-650c6f7c7ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsAndNotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_AccountsAndNotesReceivableNet_180c65ff-02b7-4aac-895b-650c6f7c7ffc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_592bb7eb-45d9-44fc-9bb9-6ce4f5100794" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_592bb7eb-45d9-44fc-9bb9-6ce4f5100794" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_603efff1-fb5a-447d-81b5-35d6a73d0efa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_603efff1-fb5a-447d-81b5-35d6a73d0efa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_15587aa0-b9ee-48cb-8923-e779e485618e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_15587aa0-b9ee-48cb-8923-e779e485618e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_68fdac6f-8cc4-492c-bb51-93368a145196" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_68fdac6f-8cc4-492c-bb51-93368a145196" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_f150746e-6382-4752-92fb-986b0991b9fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_f150746e-6382-4752-92fb-986b0991b9fa" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_a375ff8a-1a64-4a89-8958-1b6491538c49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_07cfc726-7961-4917-a92b-66bf198ee73f" xlink:to="loc_us-gaap_Assets_a375ff8a-1a64-4a89-8958-1b6491538c49" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_ecd9f093-87e1-4783-ae4f-3fda9c3676e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_SecuredDebt_ecd9f093-87e1-4783-ae4f-3fda9c3676e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayable_b380502d-b290-4345-b03a-57a23c640295" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_NotesPayable_b380502d-b290-4345-b03a-57a23c640295" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_d8cebfc8-fcf3-4917-98c3-6b6075e65c9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_UnsecuredDebt_d8cebfc8-fcf3-4917-98c3-6b6075e65c9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_31591431-db41-4fff-af26-8096f46837c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_31591431-db41-4fff-af26-8096f46837c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_abe3f709-13ca-4a59-900b-e5f367934586" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_abe3f709-13ca-4a59-900b-e5f367934586" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecurityDepositLiability_9941bf39-5925-4baa-8fd5-b1a9c39a30f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecurityDepositLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_SecurityDepositLiability_9941bf39-5925-4baa-8fd5-b1a9c39a30f4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_85241cf6-0b30-4716-8578-77d440622e74" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_OperatingLeaseLiability_85241cf6-0b30-4716-8578-77d440622e74" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_be34bb5a-b943-410a-9089-a3cfa12b0c06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_FinanceLeaseLiability_be34bb5a-b943-410a-9089-a3cfa12b0c06" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCreditsAndOtherLiabilities_6c7b619f-aece-4cb7-a6ed-ba6ac672e96e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCreditsAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_DeferredCreditsAndOtherLiabilities_6c7b619f-aece-4cb7-a6ed-ba6ac672e96e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_986183e0-2af9-4196-b859-9c1a90658fb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_55873052-ec1c-4aa0-b3bb-0ab580f5a26e" xlink:to="loc_us-gaap_Liabilities_986183e0-2af9-4196-b859-9c1a90658fb1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_c7755c52-2125-421e-8f13-36e0547fa916" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_CommitmentsAndContingencies_c7755c52-2125-421e-8f13-36e0547fa916" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_ed026678-0c96-4a73-a674-46af7a598d33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_ed026678-0c96-4a73-a674-46af7a598d33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_c84929b1-aa87-48f8-8802-cc45d45e467b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_PreferredStockValue_c84929b1-aa87-48f8-8802-cc45d45e467b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_f07509a1-6f19-4780-9ea9-91d7d3dd20a0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_CommonStockValue_f07509a1-6f19-4780-9ea9-91d7d3dd20a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_64ba3a5b-2781-4648-a280-9149c6830ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_64ba3a5b-2781-4648-a280-9149c6830ca0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncome_fde1a5e6-d40d-4025-91e8-b738de54f513" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedDistributionsInExcessOfNetIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncome_fde1a5e6-d40d-4025-91e8-b738de54f513" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ba05167d-4d54-4259-9f6c-ca28ad9573a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ba05167d-4d54-4259-9f6c-ca28ad9573a6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_5ef4b2c4-9a76-4e6e-a543-facf5e82d035" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_StockholdersEquity_5ef4b2c4-9a76-4e6e-a543-facf5e82d035" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_cfc267dd-56d6-4ca3-9ece-d0436a92b1f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_MinorityInterest_cfc267dd-56d6-4ca3-9ece-d0436a92b1f1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9bb0c697-d913-45a6-8624-73b481d3960c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_f43fec22-2505-4ceb-b945-cd8b3a1e2cce" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9bb0c697-d913-45a6-8624-73b481d3960c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAbstract_8a2ad989-9ce0-455d-860e-6b9beb593ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_PartnersCapitalAbstract_8a2ad989-9ce0-455d-860e-6b9beb593ee1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredUnitsPreferredPartnersCapitalAccounts_6b043148-9b78-43da-89d0-c2d438223c68" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredUnitsPreferredPartnersCapitalAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalAbstract_8a2ad989-9ce0-455d-860e-6b9beb593ee1" xlink:to="loc_us-gaap_PreferredUnitsPreferredPartnersCapitalAccounts_6b043148-9b78-43da-89d0-c2d438223c68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonUnitsCapitalAccounts_82bdebad-d02f-45fc-9fd9-927189b2f109" xlink:href="frt-20221231.xsd#frt_CommonUnitsCapitalAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalAbstract_8a2ad989-9ce0-455d-860e-6b9beb593ee1" xlink:to="loc_frt_CommonUnitsCapitalAccounts_82bdebad-d02f-45fc-9fd9-927189b2f109" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_2ee0ae1b-777a-4b6c-bc97-725adb9d1bda" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_65127803-46a4-48b6-991e-19b009681268" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalAbstract_8a2ad989-9ce0-455d-860e-6b9beb593ee1" xlink:to="loc_us-gaap_PartnersCapital_65127803-46a4-48b6-991e-19b009681268" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_567a2104-0fd5-434d-a52e-94ba192c9115" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalAbstract_8a2ad989-9ce0-455d-860e-6b9beb593ee1" xlink:to="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_567a2104-0fd5-434d-a52e-94ba192c9115" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_d53e1721-b958-494e-9095-8062fd08533d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalAbstract_8a2ad989-9ce0-455d-860e-6b9beb593ee1" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_d53e1721-b958-494e-9095-8062fd08533d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_8cff5256-e13b-42e1-a6db-57a400a5f53f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_8cff5256-e13b-42e1-a6db-57a400a5f53f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_f604013b-58d4-408f-85fb-13f8742f6bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_731ae6d3-1298-42f9-a316-9ad6aa8d9b36" xlink:to="loc_us-gaap_StatementTable_f604013b-58d4-408f-85fb-13f8742f6bcd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_c7246ae5-0382-4706-ad04-61c25f4b5943" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f604013b-58d4-408f-85fb-13f8742f6bcd" xlink:to="loc_us-gaap_StatementClassOfStockAxis_c7246ae5-0382-4706-ad04-61c25f4b5943" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c7246ae5-0382-4706-ad04-61c25f4b5943_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_c7246ae5-0382-4706-ad04-61c25f4b5943" xlink:to="loc_us-gaap_ClassOfStockDomain_c7246ae5-0382-4706-ad04-61c25f4b5943_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_8602e3cd-a6e3-4bc1-b140-c68400b6a95e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_c7246ae5-0382-4706-ad04-61c25f4b5943" xlink:to="loc_us-gaap_ClassOfStockDomain_8602e3cd-a6e3-4bc1-b140-c68400b6a95e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_aa33bf49-2dda-494f-987c-115115e57418" xlink:href="frt-20221231.xsd#frt_A5.0SeriesCCumulativeRedeemablePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8602e3cd-a6e3-4bc1-b140-c68400b6a95e" xlink:to="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_aa33bf49-2dda-494f-987c-115115e57418" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_661078d4-636f-4c89-9c39-c0bb3a690a97" xlink:href="frt-20221231.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8602e3cd-a6e3-4bc1-b140-c68400b6a95e" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_661078d4-636f-4c89-9c39-c0bb3a690a97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_530ad51c-d022-4161-a6b4-463c49f38b91" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f604013b-58d4-408f-85fb-13f8742f6bcd" xlink:to="loc_srt_ConsolidatedEntitiesAxis_530ad51c-d022-4161-a6b4-463c49f38b91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_530ad51c-d022-4161-a6b4-463c49f38b91_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_530ad51c-d022-4161-a6b4-463c49f38b91" xlink:to="loc_srt_ConsolidatedEntitiesDomain_530ad51c-d022-4161-a6b4-463c49f38b91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_2f6453c8-c1de-4b29-856c-54b0bb3dd132" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_530ad51c-d022-4161-a6b4-463c49f38b91" xlink:to="loc_srt_ConsolidatedEntitiesDomain_2f6453c8-c1de-4b29-856c-54b0bb3dd132" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_a216d509-a558-49e1-80d5-7651f8ad98ec" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_2f6453c8-c1de-4b29-856c-54b0bb3dd132" xlink:to="loc_srt_PartnershipInterestMember_a216d509-a558-49e1-80d5-7651f8ad98ec" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedBalanceSheetsParentheticals" xlink:type="simple" xlink:href="frt-20221231.xsd#ConsolidatedBalanceSheetsParentheticals"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedBalanceSheetsParentheticals" xlink:type="extended" id="iec15483ff4a4410b8ea911e33f1af07a_ConsolidatedBalanceSheetsParentheticals">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OperatingRealEstateFromConsolidatedVariableInterestEntities_8c54136d-89d5-4434-80b8-6d202bb1c481" xlink:href="frt-20221231.xsd#frt_OperatingRealEstateFromConsolidatedVariableInterestEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_frt_OperatingRealEstateFromConsolidatedVariableInterestEntities_8c54136d-89d5-4434-80b8-6d202bb1c481" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Constructioninprogresofconsolidatedvariableieestentity_357a6ec2-c650-48bc-9a32-b0265aa0f122" xlink:href="frt-20221231.xsd#frt_Constructioninprogresofconsolidatedvariableieestentity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_frt_Constructioninprogresofconsolidatedvariableieestentity_357a6ec2-c650-48bc-9a32-b0265aa0f122" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities_9d3a41d7-d2ed-46d1-a2f3-06c8a966bd75" xlink:href="frt-20221231.xsd#frt_AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_frt_AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities_9d3a41d7-d2ed-46d1-a2f3-06c8a966bd75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MortgagePayableFromConsolidatedVariableInterestEntities_3d8cad30-90c0-4978-9f0e-ef84bd3e6eeb" xlink:href="frt-20221231.xsd#frt_MortgagePayableFromConsolidatedVariableInterestEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_frt_MortgagePayableFromConsolidatedVariableInterestEntities_3d8cad30-90c0-4978-9f0e-ef84bd3e6eeb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_84fb5dbf-301a-4d2e-9e25-3d704c6f8b92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_84fb5dbf-301a-4d2e-9e25-3d704c6f8b92" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_14cfba79-5b41-4836-a379-b2f003afed21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_14cfba79-5b41-4836-a379-b2f003afed21" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_2ef8a060-9625-422f-bcff-9109a9d0ddc0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_2ef8a060-9625-422f-bcff-9109a9d0ddc0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_8268070e-8a87-4b9d-880d-a4244e6541ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_8268070e-8a87-4b9d-880d-a4244e6541ce" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_e5924362-06bc-477a-b4b0-2342299dfa98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredStockSharesIssued_e5924362-06bc-477a-b4b0-2342299dfa98" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_9635a740-740b-42cd-90a6-479ad43a6845" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_9635a740-740b-42cd-90a6-479ad43a6845" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_4f530cdf-eb80-4de2-9b00-ce9060f9962a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_4f530cdf-eb80-4de2-9b00-ce9060f9962a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_31ac1ccb-61a1-4c80-a8a9-1c004d430219" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_31ac1ccb-61a1-4c80-a8a9-1c004d430219" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_136eebf2-277c-4415-baf7-a5c76eb727a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_CommonStockSharesIssued_136eebf2-277c-4415-baf7-a5c76eb727a1" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_d4cb0a24-fffa-4865-aced-5afef956f944" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_d4cb0a24-fffa-4865-aced-5afef956f944" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredUnitsIssued_42c57714-e393-4fae-b18f-98aa288d6768" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredUnitsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredUnitsIssued_42c57714-e393-4fae-b18f-98aa288d6768" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredUnitsOutstanding_f7679973-d5be-4d11-a441-7ca32b780636" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredUnitsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_PreferredUnitsOutstanding_f7679973-d5be-4d11-a441-7ca32b780636" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitIssued_5187a084-bbd6-42fd-8e5a-f0af0851a070" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonUnitIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_CommonUnitIssued_5187a084-bbd6-42fd-8e5a-f0af0851a070" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitOutstanding_c2b32546-5ea0-4fc1-876e-d5f0e5008114" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonUnitOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_CommonUnitOutstanding_c2b32546-5ea0-4fc1-876e-d5f0e5008114" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2184931a-6a61-4d17-b78a-c31806076f44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2412d3b9-eeeb-4fcb-a7a1-97a8a3303342" xlink:to="loc_us-gaap_StatementTable_2184931a-6a61-4d17-b78a-c31806076f44" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_c5dac49c-b07f-4cdc-a436-dddccb2938c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2184931a-6a61-4d17-b78a-c31806076f44" xlink:to="loc_us-gaap_StatementClassOfStockAxis_c5dac49c-b07f-4cdc-a436-dddccb2938c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c5dac49c-b07f-4cdc-a436-dddccb2938c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_c5dac49c-b07f-4cdc-a436-dddccb2938c5" xlink:to="loc_us-gaap_ClassOfStockDomain_c5dac49c-b07f-4cdc-a436-dddccb2938c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3b12405b-f815-4d45-99fe-ee86ffbb6d96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_c5dac49c-b07f-4cdc-a436-dddccb2938c5" xlink:to="loc_us-gaap_ClassOfStockDomain_3b12405b-f815-4d45-99fe-ee86ffbb6d96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_6e1f5d52-eaad-4f5e-9c8b-8a9a52e4ceed" xlink:href="frt-20221231.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3b12405b-f815-4d45-99fe-ee86ffbb6d96" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_6e1f5d52-eaad-4f5e-9c8b-8a9a52e4ceed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_2edf732d-3c2a-44bf-9412-5f7e1fc698b1" xlink:href="frt-20221231.xsd#frt_A5.0SeriesCCumulativeRedeemablePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_3b12405b-f815-4d45-99fe-ee86ffbb6d96" xlink:to="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_2edf732d-3c2a-44bf-9412-5f7e1fc698b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_44e071fb-df90-4a49-adef-20a4d014076f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2184931a-6a61-4d17-b78a-c31806076f44" xlink:to="loc_srt_ConsolidatedEntitiesAxis_44e071fb-df90-4a49-adef-20a4d014076f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_44e071fb-df90-4a49-adef-20a4d014076f_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_44e071fb-df90-4a49-adef-20a4d014076f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_44e071fb-df90-4a49-adef-20a4d014076f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_d4ab0d70-cf93-495b-9051-18f55b3e9e56" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_44e071fb-df90-4a49-adef-20a4d014076f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_d4ab0d70-cf93-495b-9051-18f55b3e9e56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_180c4b0f-a29f-481e-98c3-564f8401f9bb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_d4ab0d70-cf93-495b-9051-18f55b3e9e56" xlink:to="loc_srt_PartnershipInterestMember_180c4b0f-a29f-481e-98c3-564f8401f9bb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" xlink:href="frt-20221231.xsd#ConsolidatedStatementsOfComprehensiveIncome"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended" id="i2cd5a6bc48934c8eb75f318cd1d950f1_ConsolidatedStatementsOfComprehensiveIncome">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_a330cead-197a-40d6-a774-98e29ad91907" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_RevenuesAbstract_a330cead-197a-40d6-a774-98e29ad91907" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_315945f3-72c7-4d1a-aba5-639607f52e93" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_a330cead-197a-40d6-a774-98e29ad91907" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_315945f3-72c7-4d1a-aba5-639607f52e93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RevenueMortgageInterest_32552a26-cddd-4989-89d8-57c026fd0c6f" xlink:href="frt-20221231.xsd#frt_RevenueMortgageInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_a330cead-197a-40d6-a774-98e29ad91907" xlink:to="loc_frt_RevenueMortgageInterest_32552a26-cddd-4989-89d8-57c026fd0c6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_fb19c593-1123-40e4-aad3-dfa5c89e2bff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_a330cead-197a-40d6-a774-98e29ad91907" xlink:to="loc_us-gaap_Revenues_fb19c593-1123-40e4-aad3-dfa5c89e2bff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_0dc363b5-71c1-489b-be29-3c9941ef69d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_0dc363b5-71c1-489b-be29-3c9941ef69d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateTaxExpense_9fe4ce0c-6c99-4c60-9ecd-8ffb827c385a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateTaxExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_us-gaap_RealEstateTaxExpense_9fe4ce0c-6c99-4c60-9ecd-8ffb827c385a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_40ee7d48-a96b-4b17-b1fe-04542c0400e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_40ee7d48-a96b-4b17-b1fe-04542c0400e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_6f222638-e1fa-4f47-b662-94421ee702fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_us-gaap_DepreciationAndAmortization_6f222638-e1fa-4f47-b662-94421ee702fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_e2ff467a-039b-48b8-a224-ab58bc8d9651" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_us-gaap_OperatingExpenses_e2ff467a-039b-48b8-a224-ab58bc8d9651" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetImpairmentCharges_dd85aaeb-3e1a-4b70-9795-9f82d0df0268" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_us-gaap_OtherAssetImpairmentCharges_dd85aaeb-3e1a-4b70-9795-9f82d0df0268" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DeconsolidationOfVIEGainLossAmount_417ee875-6583-41da-b72e-db7592d84a2e" xlink:href="frt-20221231.xsd#frt_DeconsolidationOfVIEGainLossAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_frt_DeconsolidationOfVIEGainLossAmount_417ee875-6583-41da-b72e-db7592d84a2e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest_8b6118a6-4ad7-42b7-8363-d28debd6f3a0" xlink:href="frt-20221231.xsd#frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_1483745b-81b4-45c7-9dd6-a9554f8a4166" xlink:to="loc_frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest_8b6118a6-4ad7-42b7-8363-d28debd6f3a0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_218dccf6-e064-47b8-a143-95b33adc486b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_OperatingIncomeLoss_218dccf6-e064-47b8-a143-95b33adc486b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncomeAndExpensesAbstract_93bcb61e-8bec-4513-9b23-69994182de70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherIncomeAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_OtherIncomeAndExpensesAbstract_93bcb61e-8bec-4513-9b23-69994182de70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_3c7b9cc6-b890-4e71-8b86-ac4fa94f08bf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestIncomeOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_93bcb61e-8bec-4513-9b23-69994182de70" xlink:to="loc_us-gaap_InterestIncomeOther_3c7b9cc6-b890-4e71-8b86-ac4fa94f08bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_eb88afcc-5cdd-4e51-8fad-2dca0269231a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_93bcb61e-8bec-4513-9b23-69994182de70" xlink:to="loc_us-gaap_InterestExpense_eb88afcc-5cdd-4e51-8fad-2dca0269231a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_c7e5b672-8101-4a66-9f14-e7d1e5980de9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_93bcb61e-8bec-4513-9b23-69994182de70" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_c7e5b672-8101-4a66-9f14-e7d1e5980de9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_51359f61-5422-41a0-8d55-c555aff6b7cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_93bcb61e-8bec-4513-9b23-69994182de70" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_51359f61-5422-41a0-8d55-c555aff6b7cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_45c0f44a-83b5-4ca5-90a2-a413963ebe94" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_ProfitLoss_45c0f44a-83b5-4ca5-90a2-a413963ebe94" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_de6bd42b-e058-4663-a33f-d546da593350" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_de6bd42b-e058-4663-a33f-d546da593350" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_b1e917eb-e365-4f69-8f65-54f56a44b5d3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_NetIncomeLoss_b1e917eb-e365-4f69-8f65-54f56a44b5d3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_80cbf81e-ce4c-46f4-9fe1-d6f9f05b870a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_80cbf81e-ce4c-46f4-9fe1-d6f9f05b870a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DistributionsDeclaredToPreferredUnitHolders_4abdd015-02fd-430f-9827-7de87ce93213" xlink:href="frt-20221231.xsd#frt_DistributionsDeclaredToPreferredUnitHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_frt_DistributionsDeclaredToPreferredUnitHolders_4abdd015-02fd-430f-9827-7de87ce93213" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_8c7a0788-41bc-44fa-b0b6-ec65c984262d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_8c7a0788-41bc-44fa-b0b6-ec65c984262d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAllocatedToGeneralPartners_0f130104-7664-4ded-a79d-e7df9ba107ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAllocatedToGeneralPartners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_NetIncomeLossAllocatedToGeneralPartners_0f130104-7664-4ded-a79d-e7df9ba107ec" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_6b89e7ee-d057-4e80-b513-69be360d41c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_6b89e7ee-d057-4e80-b513-69be360d41c5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_b35bc880-c09b-4d6d-a228-ca742a469455" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_6b89e7ee-d057-4e80-b513-69be360d41c5" xlink:to="loc_us-gaap_EarningsPerShareBasic_b35bc880-c09b-4d6d-a228-ca742a469455" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_eacdc7b2-ac53-4ddb-bfde-d9b48db1ae2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_6b89e7ee-d057-4e80-b513-69be360d41c5" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_eacdc7b2-ac53-4ddb-bfde-d9b48db1ae2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_68155cdb-a19b-4ff9-a61e-d9b6bcf9502f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_68155cdb-a19b-4ff9-a61e-d9b6bcf9502f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_ec4750a5-4674-4a33-a7cc-dcff707fd1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_68155cdb-a19b-4ff9-a61e-d9b6bcf9502f" xlink:to="loc_us-gaap_EarningsPerShareDiluted_ec4750a5-4674-4a33-a7cc-dcff707fd1f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d4955faa-404d-4fc7-9291-67f8a8ce8bc6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_68155cdb-a19b-4ff9-a61e-d9b6bcf9502f" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d4955faa-404d-4fc7-9291-67f8a8ce8bc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EARNINGSPERCOMMONUNITBASICAbstract_e146bd4f-593f-4805-ae47-68258a7802e8" xlink:href="frt-20221231.xsd#frt_EARNINGSPERCOMMONUNITBASICAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_frt_EARNINGSPERCOMMONUNITBASICAbstract_e146bd4f-593f-4805-ae47-68258a7802e8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerOutstandingGeneralPartnershipUnitNetOfTax_5190046d-fdc5-4b39-9b1b-773948f74b38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsPerOutstandingGeneralPartnershipUnitNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EARNINGSPERCOMMONUNITBASICAbstract_e146bd4f-593f-4805-ae47-68258a7802e8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerOutstandingGeneralPartnershipUnitNetOfTax_5190046d-fdc5-4b39-9b1b-773948f74b38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic_79a3cb42-a0cc-438b-af0b-2ce7056eac29" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EARNINGSPERCOMMONUNITBASICAbstract_e146bd4f-593f-4805-ae47-68258a7802e8" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic_79a3cb42-a0cc-438b-af0b-2ce7056eac29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EARNINGSPERCOMMONUNITDILUTEDAbstract_872b474f-e979-4fbc-9f08-ee61e5d10e71" xlink:href="frt-20221231.xsd#frt_EARNINGSPERCOMMONUNITDILUTEDAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_frt_EARNINGSPERCOMMONUNITDILUTEDAbstract_872b474f-e979-4fbc-9f08-ee61e5d10e71" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NetIncomeAvailableForCommonUnitHoldersDiluted_35182431-ffc9-4b91-8800-1c2ca9ca3aef" xlink:href="frt-20221231.xsd#frt_NetIncomeAvailableForCommonUnitHoldersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EARNINGSPERCOMMONUNITDILUTEDAbstract_872b474f-e979-4fbc-9f08-ee61e5d10e71" xlink:to="loc_frt_NetIncomeAvailableForCommonUnitHoldersDiluted_35182431-ffc9-4b91-8800-1c2ca9ca3aef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WeightedAverageCommonUnitsOutstandingDiluted_2b50220d-a1fa-485c-b9b5-996fb9db2ced" xlink:href="frt-20221231.xsd#frt_WeightedAverageCommonUnitsOutstandingDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EARNINGSPERCOMMONUNITDILUTEDAbstract_872b474f-e979-4fbc-9f08-ee61e5d10e71" xlink:to="loc_frt_WeightedAverageCommonUnitsOutstandingDiluted_2b50220d-a1fa-485c-b9b5-996fb9db2ced" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_4e9ae69d-2e17-4baa-9288-2aaeb69f2c40" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_4e9ae69d-2e17-4baa-9288-2aaeb69f2c40" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_2a7e953b-a76b-45ad-a6bf-95bbbf76c11f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_14885da3-f250-4444-a940-bf84e5535449" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_4e9ae69d-2e17-4baa-9288-2aaeb69f2c40" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_14885da3-f250-4444-a940-bf84e5535449" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_5b12144c-1193-4c56-9d0f-f9e78394d7b6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_4e9ae69d-2e17-4baa-9288-2aaeb69f2c40" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_5b12144c-1193-4c56-9d0f-f9e78394d7b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_7bcca633-18f5-4fb4-a339-7fcc2101776d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_4e9ae69d-2e17-4baa-9288-2aaeb69f2c40" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_7bcca633-18f5-4fb4-a339-7fcc2101776d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_cfe7d500-85e2-44ea-9f9c-859082905188" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_4e9ae69d-2e17-4baa-9288-2aaeb69f2c40" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_cfe7d500-85e2-44ea-9f9c-859082905188" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_ebe00ab6-f720-4860-a647-253cd9252dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7c968211-e5c5-4551-82f3-feb5ca0745b7" xlink:to="loc_us-gaap_StatementTable_ebe00ab6-f720-4860-a647-253cd9252dd5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_a6254b2b-7e72-4388-bb16-d2f89f41b501" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_ebe00ab6-f720-4860-a647-253cd9252dd5" xlink:to="loc_srt_ConsolidatedEntitiesAxis_a6254b2b-7e72-4388-bb16-d2f89f41b501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_a6254b2b-7e72-4388-bb16-d2f89f41b501_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_a6254b2b-7e72-4388-bb16-d2f89f41b501" xlink:to="loc_srt_ConsolidatedEntitiesDomain_a6254b2b-7e72-4388-bb16-d2f89f41b501_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_7502def1-68a8-4548-8b6f-7d26cd54e4a4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_a6254b2b-7e72-4388-bb16-d2f89f41b501" xlink:to="loc_srt_ConsolidatedEntitiesDomain_7502def1-68a8-4548-8b6f-7d26cd54e4a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_704b3a30-f4e5-469c-a580-eb87a4b14b1f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7502def1-68a8-4548-8b6f-7d26cd54e4a4" xlink:to="loc_srt_PartnershipInterestMember_704b3a30-f4e5-469c-a580-eb87a4b14b1f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementOfShareholdersEquity" xlink:type="simple" xlink:href="frt-20221231.xsd#ConsolidatedStatementOfShareholdersEquity"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementOfShareholdersEquity" xlink:type="extended" id="i1ca583688de1478d8d008659127ab23b_ConsolidatedStatementOfShareholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_41dbbaf1-b251-4202-a020-b56fcc061f27" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_41dbbaf1-b251-4202-a020-b56fcc061f27" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_85adbaa3-9aba-4e9e-be6b-8cb26d91f741" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_SharesOutstanding_85adbaa3-9aba-4e9e-be6b-8cb26d91f741" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ebddbd48-3be4-4b71-96f9-0d44201a8d16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ebddbd48-3be4-4b71-96f9-0d44201a8d16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AdoptionOfNewAccountingStandard_ad8702f3-1be3-4715-811c-632b01de1bca" xlink:href="frt-20221231.xsd#frt_AdoptionOfNewAccountingStandard"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_AdoptionOfNewAccountingStandard_ad8702f3-1be3-4715-811c-632b01de1bca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ProfitLossExcludingRedeemableNoncontrollingInterests_93c8abb2-a46e-49f5-87e4-77027718f373" xlink:href="frt-20221231.xsd#frt_ProfitLossExcludingRedeemableNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_ProfitLossExcludingRedeemableNoncontrollingInterests_93c8abb2-a46e-49f5-87e4-77027718f373" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OtherComprehensiveIncomeLossNetOfPortionAttributableToNoncontrollingInterest_6a15fd90-0d9c-48f1-a2dc-21e236f05011" xlink:href="frt-20221231.xsd#frt_OtherComprehensiveIncomeLossNetOfPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_OtherComprehensiveIncomeLossNetOfPortionAttributableToNoncontrollingInterest_6a15fd90-0d9c-48f1-a2dc-21e236f05011" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_1ad7008d-2280-47b4-9ca6-0fb6e41520c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_DividendsCommonStockCash_1ad7008d-2280-47b4-9ca6-0fb6e41520c6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_98946ec4-5885-4c5f-9b11-ec87f7e2493a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_DividendsPreferredStockCash_98946ec4-5885-4c5f-9b11-ec87f7e2493a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_78147263-6da3-4d77-b472-42eaa43f22ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_78147263-6da3-4d77-b472-42eaa43f22ea" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_be9ccbda-07d8-4770-8ebb-b4bd1c445a9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_be9ccbda-07d8-4770-8ebb-b4bd1c445a9f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_5c918063-eec0-4ab4-b26e-1af7b207ca7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_5c918063-eec0-4ab4-b26e-1af7b207ca7b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ExerciseOfStockOptions_f0111a8f-8381-4319-abed-bfd4749aed71" xlink:href="frt-20221231.xsd#frt_ExerciseOfStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_ExerciseOfStockOptions_f0111a8f-8381-4319-abed-bfd4749aed71" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_e836ad2b-5efd-439e-89eb-6cd8caa273c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_e836ad2b-5efd-439e-89eb-6cd8caa273c5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_78704160-18fc-44f2-b386-f7c66a82cc12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_78704160-18fc-44f2-b386-f7c66a82cc12" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_ed69241e-4af6-450b-8282-8066cb8f8220" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_ed69241e-4af6-450b-8282-8066cb8f8220" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShareBasedCompensationExpenseNetShares_288928ef-7246-497d-819f-b8a2bf33979f" xlink:href="frt-20221231.xsd#frt_ShareBasedCompensationExpenseNetShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_ShareBasedCompensationExpenseNetShares_288928ef-7246-497d-819f-b8a2bf33979f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShareBasedCompensationExpenseNetValue_b393680f-60be-487b-949c-54679f16ee14" xlink:href="frt-20221231.xsd#frt_ShareBasedCompensationExpenseNetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_ShareBasedCompensationExpenseNetValue_b393680f-60be-487b-949c-54679f16ee14" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_e782f27c-6f4f-4d69-826a-5fc511344caf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_e782f27c-6f4f-4d69-826a-5fc511344caf" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_79d50761-411d-4576-be72-9037367928d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_79d50761-411d-4576-be72-9037367928d4" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_1144a310-37ab-465d-8205-d47840c3d84c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConversionOfStockSharesConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_ConversionOfStockSharesConverted1_1144a310-37ab-465d-8205-d47840c3d84c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockAmountConverted1_7a98c6dd-bc45-48ce-8ae4-91cc473467b0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConversionOfStockAmountConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_ConversionOfStockAmountConverted1_7a98c6dd-bc45-48ce-8ae4-91cc473467b0" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_78c6259e-d2f4-409f-a7ae-c9ace5914270" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_78c6259e-d2f4-409f-a7ae-c9ace5914270" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_748d5edf-7c22-4199-817a-31c3d8feaa43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_748d5edf-7c22-4199-817a-31c3d8feaa43" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_912e37f5-b49c-4257-81d8-96e675081a4d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_912e37f5-b49c-4257-81d8-96e675081a4d" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_37c21f01-5053-4551-a915-ffcad4d5a5dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfUnits_37c21f01-5053-4551-a915-ffcad4d5a5dc" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Contributionsfromnoncontrollinginterests_504855cb-c883-4dee-a5e1-29b1e1f73e43" xlink:href="frt-20221231.xsd#frt_Contributionsfromnoncontrollinginterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_Contributionsfromnoncontrollinginterests_504855cb-c883-4dee-a5e1-29b1e1f73e43" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_d089a5ef-9057-477d-9d89-1192a3bd9907" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_d089a5ef-9057-477d-9d89-1192a3bd9907" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DeconsolidationFromVIE_4222a29c-2e64-4803-a2d3-904686eae02d" xlink:href="frt-20221231.xsd#frt_DeconsolidationFromVIE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_frt_DeconsolidationFromVIE_4222a29c-2e64-4803-a2d3-904686eae02d" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_88e6fedc-0fb5-41df-bc5b-4b4dc3b89bc5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c290205e-dba0-4437-a853-6eb23dc7f0bb" xlink:to="loc_us-gaap_StockholdersEquityOther_88e6fedc-0fb5-41df-bc5b-4b4dc3b89bc5" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_02728c7e-6f5e-43ca-9d02-7aa02870f967" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_b12528c6-e107-4ca3-b88a-2ca733e28c33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_d0324a41-02f1-4118-8b1a-32271b1621cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_41dbbaf1-b251-4202-a020-b56fcc061f27" xlink:to="loc_us-gaap_StatementTable_d0324a41-02f1-4118-8b1a-32271b1621cc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1e8eac75-1127-46f9-ac57-f519f024333e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d0324a41-02f1-4118-8b1a-32271b1621cc" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1e8eac75-1127-46f9-ac57-f519f024333e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1e8eac75-1127-46f9-ac57-f519f024333e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1e8eac75-1127-46f9-ac57-f519f024333e" xlink:to="loc_us-gaap_ClassOfStockDomain_1e8eac75-1127-46f9-ac57-f519f024333e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_a74eb649-d468-42fc-b752-525d799a67ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1e8eac75-1127-46f9-ac57-f519f024333e" xlink:to="loc_us-gaap_ClassOfStockDomain_a74eb649-d468-42fc-b752-525d799a67ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_af495dc1-2011-4081-8b3c-e055c7ea538f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a74eb649-d468-42fc-b752-525d799a67ad" xlink:to="loc_us-gaap_CommonStockMember_af495dc1-2011-4081-8b3c-e055c7ea538f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_47f83fe1-5574-44cc-b5dc-27f2861bef0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a74eb649-d468-42fc-b752-525d799a67ad" xlink:to="loc_us-gaap_PreferredStockMember_47f83fe1-5574-44cc-b5dc-27f2861bef0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_2575a949-8315-4430-8d9f-9b6a4f7120d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d0324a41-02f1-4118-8b1a-32271b1621cc" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2575a949-8315-4430-8d9f-9b6a4f7120d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2575a949-8315-4430-8d9f-9b6a4f7120d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2575a949-8315-4430-8d9f-9b6a4f7120d4" xlink:to="loc_us-gaap_EquityComponentDomain_2575a949-8315-4430-8d9f-9b6a4f7120d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2575a949-8315-4430-8d9f-9b6a4f7120d4" xlink:to="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_910c5aaf-37a7-428c-8d4b-3116747a38d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:to="loc_us-gaap_PreferredStockMember_910c5aaf-37a7-428c-8d4b-3116747a38d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_3b9f9551-1f5b-4f49-bc0f-6306883e1ccf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:to="loc_us-gaap_CommonStockMember_3b9f9551-1f5b-4f49-bc0f-6306883e1ccf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_3a018339-492a-4137-8ef1-50efb0c4ecf3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_3a018339-492a-4137-8ef1-50efb0c4ecf3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_994bd179-49a6-4502-b8c7-4e3d59d2cd0f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:to="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_994bd179-49a6-4502-b8c7-4e3d59d2cd0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_39872463-b72a-4bae-a25d-9c3bf65c1d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_39872463-b72a-4bae-a25d-9c3bf65c1d3f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_644fb88d-161e-4ed5-8529-b5c756094bd1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ad749515-2228-4862-a477-04a74c803ccb" xlink:to="loc_us-gaap_NoncontrollingInterestMember_644fb88d-161e-4ed5-8529-b5c756094bd1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeAxis_ed5b310b-51fb-4f17-91dd-9bd232bc6dcd" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d0324a41-02f1-4118-8b1a-32271b1621cc" xlink:to="loc_frt_ConvertibleUnitTypeAxis_ed5b310b-51fb-4f17-91dd-9bd232bc6dcd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeDomain_ed5b310b-51fb-4f17-91dd-9bd232bc6dcd_default" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_ConvertibleUnitTypeAxis_ed5b310b-51fb-4f17-91dd-9bd232bc6dcd" xlink:to="loc_frt_ConvertibleUnitTypeDomain_ed5b310b-51fb-4f17-91dd-9bd232bc6dcd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeDomain_ab0e7803-2890-4add-ae70-2f50b5396c5f" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_ConvertibleUnitTypeAxis_ed5b310b-51fb-4f17-91dd-9bd232bc6dcd" xlink:to="loc_frt_ConvertibleUnitTypeDomain_ab0e7803-2890-4add-ae70-2f50b5396c5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DownREITOPUnitsMember_b85f17fd-6785-440f-b3b6-6dbac8ad8180" xlink:href="frt-20221231.xsd#frt_DownREITOPUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ConvertibleUnitTypeDomain_ab0e7803-2890-4add-ae70-2f50b5396c5f" xlink:to="loc_frt_DownREITOPUnitsMember_b85f17fd-6785-440f-b3b6-6dbac8ad8180" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_4190b20e-caf3-4fc4-a3ac-273ae0558a1e" xlink:href="frt-20221231.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ConvertibleUnitTypeDomain_ab0e7803-2890-4add-ae70-2f50b5396c5f" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_4190b20e-caf3-4fc4-a3ac-273ae0558a1e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="simple" xlink:href="frt-20221231.xsd#ConsolidatedStatementsOfCashFlows"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended" id="i810775e278c84cf19c3bdcf7ff14dfcb_ConsolidatedStatementsOfCashFlows">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4d847eab-b7fb-4e3c-add0-d609ad602965" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5d2dc61e-1109-4f9a-bfd5-af5697dbb477" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d847eab-b7fb-4e3c-add0-d609ad602965" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5d2dc61e-1109-4f9a-bfd5-af5697dbb477" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_91b0130c-349f-417f-8cbd-3784b56f941e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5d2dc61e-1109-4f9a-bfd5-af5697dbb477" xlink:to="loc_us-gaap_ProfitLoss_91b0130c-349f-417f-8cbd-3784b56f941e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5d2dc61e-1109-4f9a-bfd5-af5697dbb477" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AdjustmentDepreciationAndAmortization_949ea52f-8e4e-483b-b7d5-403296068014" xlink:href="frt-20221231.xsd#frt_AdjustmentDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_frt_AdjustmentDepreciationAndAmortization_949ea52f-8e4e-483b-b7d5-403296068014" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetImpairmentCharges_a15c04e5-ed0f-48f2-bf9f-b67f5d9be8ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_us-gaap_OtherAssetImpairmentCharges_a15c04e5-ed0f-48f2-bf9f-b67f5d9be8ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DeconsolidationOfVIEGainLossAmount_1a1a565d-54a0-49a2-9ba1-cba03b9cc7fd" xlink:href="frt-20221231.xsd#frt_DeconsolidationOfVIEGainLossAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_frt_DeconsolidationOfVIEGainLossAmount_1a1a565d-54a0-49a2-9ba1-cba03b9cc7fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest_d5953ae3-77da-43ee-a9da-458a97fef779" xlink:href="frt-20221231.xsd#frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest_d5953ae3-77da-43ee-a9da-458a97fef779" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_059ea16b-db5b-43c7-9483-eb9b4d44a65c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_059ea16b-db5b-43c7-9483-eb9b4d44a65c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_8ecdcd4c-38b7-4f71-b33a-4cc07f32880c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_8ecdcd4c-38b7-4f71-b33a-4cc07f32880c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StraightLineRent_842ce0b2-d5cd-42c5-8797-2034680d0b6a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StraightLineRent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_us-gaap_StraightLineRent_842ce0b2-d5cd-42c5-8797-2034680d0b6a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_660891eb-c58a-4b89-9217-3caae2531753" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_us-gaap_ShareBasedCompensation_660891eb-c58a-4b89-9217-3caae2531753" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_dd2151ac-af65-4aad-b989-e19dea4daede" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_dd2151ac-af65-4aad-b989-e19dea4daede" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_b09aeb04-20d5-4877-bdcb-671dc30bd5c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_7aa355c5-e70f-44a6-945a-7a9d59f5a219" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_b09aeb04-20d5-4877-bdcb-671dc30bd5c6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_f46222b0-b54c-4cfe-9a13-69ff304eda30" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_b09aeb04-20d5-4877-bdcb-671dc30bd5c6" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_f46222b0-b54c-4cfe-9a13-69ff304eda30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_fc4759f6-79cd-4aa1-aa29-37862625da55" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_b09aeb04-20d5-4877-bdcb-671dc30bd5c6" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_fc4759f6-79cd-4aa1-aa29-37862625da55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6f87a870-12e8-451a-b026-26cff673d7f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_b09aeb04-20d5-4877-bdcb-671dc30bd5c6" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6f87a870-12e8-451a-b026-26cff673d7f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_IncreaseDecreaseInSecurityDepositsAndOtherLiabilities_1db4fdaa-1306-4561-8cdd-c19f3c4343a5" xlink:href="frt-20221231.xsd#frt_IncreaseDecreaseInSecurityDepositsAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_b09aeb04-20d5-4877-bdcb-671dc30bd5c6" xlink:to="loc_frt_IncreaseDecreaseInSecurityDepositsAndOtherLiabilities_1db4fdaa-1306-4561-8cdd-c19f3c4343a5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_b27a86f4-7c57-461c-87cb-8f953e9e726f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_5d2dc61e-1109-4f9a-bfd5-af5697dbb477" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_b27a86f4-7c57-461c-87cb-8f953e9e726f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d847eab-b7fb-4e3c-add0-d609ad602965" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireRealEstate_df8be360-7b70-4bb0-8f6e-0f0bbf8c635c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_us-gaap_PaymentsToAcquireRealEstate_df8be360-7b70-4bb0-8f6e-0f0bbf8c635c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CapitalExpendituresDevelopmentRedevelopment_44bbfad2-a9a0-48d5-a75d-fce8b8e6815f" xlink:href="frt-20221231.xsd#frt_CapitalExpendituresDevelopmentRedevelopment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_frt_CapitalExpendituresDevelopmentRedevelopment_44bbfad2-a9a0-48d5-a75d-fce8b8e6815f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CapitalExpendituresOther_f049d924-fda5-4dd2-a7fc-fd97877f60ce" xlink:href="frt-20221231.xsd#frt_CapitalExpendituresOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_frt_CapitalExpendituresOther_f049d924-fda5-4dd2-a7fc-fd97877f60ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CostsAssociatedWithLeaseBuyoutForAPropertySold_66ee4f77-a825-4dab-930a-eec47fe692f1" xlink:href="frt-20221231.xsd#frt_CostsAssociatedWithLeaseBuyoutForAPropertySold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_frt_CostsAssociatedWithLeaseBuyoutForAPropertySold_66ee4f77-a825-4dab-930a-eec47fe692f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRealEstateAndRealEstateJointVentures_1f5b99ba-7f13-4c8e-ba1b-78736c7687e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromRealEstateAndRealEstateJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_us-gaap_ProceedsFromRealEstateAndRealEstateJointVentures_1f5b99ba-7f13-4c8e-ba1b-78736c7687e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDivestedFromDeconsolidation_ffedb89d-d94d-467b-94f2-7bd3460947cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashDivestedFromDeconsolidation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_us-gaap_CashDivestedFromDeconsolidation_ffedb89d-d94d-467b-94f2-7bd3460947cb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates_6d6c9af8-46ff-4cff-abce-9ac25b8657cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates_6d6c9af8-46ff-4cff-abce-9ac25b8657cd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships_363c5f26-27f2-4848-99f5-b59329717ce0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships_363c5f26-27f2-4848-99f5-b59329717ce0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInLeaseAcquisitionCosts_4ff1ec33-1f11-4d63-af7a-2dfe541fbaf5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInLeaseAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_us-gaap_IncreaseDecreaseInLeaseAcquisitionCosts_4ff1ec33-1f11-4d63-af7a-2dfe541fbaf5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_IssuanceRepaymentsOfMortgageAndOtherNotesReceivableNet_5d7c21d2-e0c1-4b79-990d-a4691a5c642c" xlink:href="frt-20221231.xsd#frt_IssuanceRepaymentsOfMortgageAndOtherNotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_frt_IssuanceRepaymentsOfMortgageAndOtherNotesReceivableNet_5d7c21d2-e0c1-4b79-990d-a4691a5c642c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_54764de8-8962-4b03-89ca-d30b9dfc0332" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_bbdcc02d-53c5-47cf-869d-5e250c6a3274" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_54764de8-8962-4b03-89ca-d30b9dfc0332" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d847eab-b7fb-4e3c-add0-d609ad602965" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_03efe241-b6f6-4052-9843-6b987ed9794b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromRepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_03efe241-b6f6-4052-9843-6b987ed9794b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_21c6d006-bf79-4b39-afa9-5148db7c417d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_21c6d006-bf79-4b39-afa9-5148db7c417d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_04b741d4-9b1a-4e9e-bc0a-60b0e03b8166" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_04b741d4-9b1a-4e9e-bc0a-60b0e03b8166" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromNotesPayable_c81e11c8-9152-4561-8e3d-2924b3cb1024" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_ProceedsFromNotesPayable_c81e11c8-9152-4561-8e3d-2924b3cb1024" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RepaymentOfMortgagesFinanceLeasesAndNotesPayable_c7baa34d-2ae4-42d9-8429-75fc5f4ca9ff" xlink:href="frt-20221231.xsd#frt_RepaymentOfMortgagesFinanceLeasesAndNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_frt_RepaymentOfMortgagesFinanceLeasesAndNotesPayable_c7baa34d-2ae4-42d9-8429-75fc5f4ca9ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_1c2f8f9e-ce68-4e06-9bf7-d69c2a3ddb2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_1c2f8f9e-ce68-4e06-9bf7-d69c2a3ddb2d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DividendsPaidToCommonAndPreferredShareholders_227b41fc-fcc2-4a43-8dad-d40a546d8a3f" xlink:href="frt-20221231.xsd#frt_DividendsPaidToCommonAndPreferredShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_frt_DividendsPaidToCommonAndPreferredShareholders_227b41fc-fcc2-4a43-8dad-d40a546d8a3f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_5dbdf533-0374-44dd-9408-176442cfe774" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_5dbdf533-0374-44dd-9408-176442cfe774" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_fb73812b-0577-4563-99ab-26148d93f925" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_fb73812b-0577-4563-99ab-26148d93f925" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Paymentsofdividendsandredemptionsminorityinterest_dda19fd6-fdc7-4e77-abf2-835620a1e718" xlink:href="frt-20221231.xsd#frt_Paymentsofdividendsandredemptionsminorityinterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_frt_Paymentsofdividendsandredemptionsminorityinterest_dda19fd6-fdc7-4e77-abf2-835620a1e718" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0714340a-3c6a-4241-b0e2-f10011a83611" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_6a0abd8f-dca8-4c70-bc24-c502931d3a4e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0714340a-3c6a-4241-b0e2-f10011a83611" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_9f769a70-6cd9-41a2-aa8f-30c3350c51b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d847eab-b7fb-4e3c-add0-d609ad602965" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_9f769a70-6cd9-41a2-aa8f-30c3350c51b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b465c3b6-8176-4c8b-915a-4ec06e7c8e73" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d847eab-b7fb-4e3c-add0-d609ad602965" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b465c3b6-8176-4c8b-915a-4ec06e7c8e73" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2d2efc4a-da3a-4836-81de-1f06c6f60103" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_4d8ba654-dbd4-4385-b9b6-056a6d974edf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4d847eab-b7fb-4e3c-add0-d609ad602965" xlink:to="loc_us-gaap_StatementTable_4d8ba654-dbd4-4385-b9b6-056a6d974edf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_8926bc84-87ea-464d-aa1a-b399657267c2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4d8ba654-dbd4-4385-b9b6-056a6d974edf" xlink:to="loc_srt_ConsolidatedEntitiesAxis_8926bc84-87ea-464d-aa1a-b399657267c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_8926bc84-87ea-464d-aa1a-b399657267c2_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_8926bc84-87ea-464d-aa1a-b399657267c2" xlink:to="loc_srt_ConsolidatedEntitiesDomain_8926bc84-87ea-464d-aa1a-b399657267c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_a6b4d687-4aec-4b27-9ba3-ea8b8b681e65" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_8926bc84-87ea-464d-aa1a-b399657267c2" xlink:to="loc_srt_ConsolidatedEntitiesDomain_a6b4d687-4aec-4b27-9ba3-ea8b8b681e65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_6f3a61ef-16d6-4c9f-8ca4-25d6b3c67624" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_a6b4d687-4aec-4b27-9ba3-ea8b8b681e65" xlink:to="loc_srt_PartnershipInterestMember_6f3a61ef-16d6-4c9f-8ca4-25d6b3c67624" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementsofCapital" xlink:type="simple" xlink:href="frt-20221231.xsd#ConsolidatedStatementsofCapital"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementsofCapital" xlink:type="extended" id="ic70bbb5f7e364242aa830bf641e62979_ConsolidatedStatementsofCapital">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_b7420ea3-f104-465c-954f-6bb4030022e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_b7420ea3-f104-465c-954f-6bb4030022e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AdoptionOfNewAccountingStandard_44182cce-cd31-47c8-84f7-e8c416e2c016" xlink:href="frt-20221231.xsd#frt_AdoptionOfNewAccountingStandard"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_AdoptionOfNewAccountingStandard_44182cce-cd31-47c8-84f7-e8c416e2c016" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_c64531a7-ebe4-4456-8310-27dd3ea0f852" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest_c64531a7-ebe4-4456-8310-27dd3ea0f852" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OtherComprehensiveIncomeLossNetOfPortionAttributableToNoncontrollingInterest_4bac9bd7-23bd-4eff-88c8-93ef103ced88" xlink:href="frt-20221231.xsd#frt_OtherComprehensiveIncomeLossNetOfPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_OtherComprehensiveIncomeLossNetOfPortionAttributableToNoncontrollingInterest_4bac9bd7-23bd-4eff-88c8-93ef103ced88" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DistributionsDeclaredToCommonUnitHolders_0e76590c-0939-4686-ad02-f73fa1183add" xlink:href="frt-20221231.xsd#frt_DistributionsDeclaredToCommonUnitHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_DistributionsDeclaredToCommonUnitHolders_0e76590c-0939-4686-ad02-f73fa1183add" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DistributionsDeclaredToPreferredUnitHolders_5736feab-6349-4245-93ee-693200077268" xlink:href="frt-20221231.xsd#frt_DistributionsDeclaredToPreferredUnitHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_DistributionsDeclaredToPreferredUnitHolders_5736feab-6349-4245-93ee-693200077268" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DistributionsDeclaredToNoncontrollingInterestsInConsolidatedPartnershipsExcludingAmountsAttributableToRedeemableNoncontrollingInterests_062b28eb-25df-4429-a885-1a5fc6ba5108" xlink:href="frt-20221231.xsd#frt_DistributionsDeclaredToNoncontrollingInterestsInConsolidatedPartnershipsExcludingAmountsAttributableToRedeemableNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_DistributionsDeclaredToNoncontrollingInterestsInConsolidatedPartnershipsExcludingAmountsAttributableToRedeemableNoncontrollingInterests_062b28eb-25df-4429-a885-1a5fc6ba5108" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountContributions_4502578a-68eb-4c86-bdd5-73c57fe4719e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountContributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_PartnersCapitalAccountContributions_4502578a-68eb-4c86-bdd5-73c57fe4719e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountOptionExercise_7e2da5fd-7744-44c6-8ea3-48721f1686b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountOptionExercise"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_PartnersCapitalAccountOptionExercise_7e2da5fd-7744-44c6-8ea3-48721f1686b3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonUnitsIssuedUnderDividendReinvestmentPlan_24065686-1471-4da1-a394-79def80a437c" xlink:href="frt-20221231.xsd#frt_CommonUnitsIssuedUnderDividendReinvestmentPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_CommonUnitsIssuedUnderDividendReinvestmentPlan_24065686-1471-4da1-a394-79def80a437c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation_6d868f7f-621f-49db-87ca-5786f175628d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountUnitBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation_6d868f7f-621f-49db-87ca-5786f175628d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PartnersCapitalAccountEmployeeTaxWithholdings_9d3c761a-970e-404a-a2ff-fa34b8d9030a" xlink:href="frt-20221231.xsd#frt_PartnersCapitalAccountEmployeeTaxWithholdings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_PartnersCapitalAccountEmployeeTaxWithholdings_9d3c761a-970e-404a-a2ff-fa34b8d9030a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConversionOfPreferredUnits_172cc8b2-11d1-4e47-9c2e-22d26047cdd6" xlink:href="frt-20221231.xsd#frt_ConversionOfPreferredUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_ConversionOfPreferredUnits_172cc8b2-11d1-4e47-9c2e-22d26047cdd6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConversionOfPreferredUnitsValue_3bb851d7-69b9-41d1-82f4-5f725f959635" xlink:href="frt-20221231.xsd#frt_ConversionOfPreferredUnitsValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_ConversionOfPreferredUnitsValue_3bb851d7-69b9-41d1-82f4-5f725f959635" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountExchangesAndConversions_dc6d647c-fb1d-470f-abf0-faff87832792" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountExchangesAndConversions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_PartnersCapitalAccountExchangesAndConversions_dc6d647c-fb1d-470f-abf0-faff87832792" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Contributionsfromnoncontrollinginterests_8ce24add-e0eb-4033-af86-e74353e88ded" xlink:href="frt-20221231.xsd#frt_Contributionsfromnoncontrollinginterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_Contributionsfromnoncontrollinginterests_8ce24add-e0eb-4033-af86-e74353e88ded" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_d2f62912-8d25-4699-b20e-8fa7702b87d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_d2f62912-8d25-4699-b20e-8fa7702b87d8" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DeconsolidationFromVIE_f0c3e6a4-6af6-476f-93e1-c966e9fc725f" xlink:href="frt-20221231.xsd#frt_DeconsolidationFromVIE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_frt_DeconsolidationFromVIE_f0c3e6a4-6af6-476f-93e1-c966e9fc725f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalOther_591403bf-1ba6-4229-a702-9f482147ddf2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_PartnersCapitalOther_591403bf-1ba6-4229-a702-9f482147ddf2" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_0c8b2c65-9527-43c2-9ca4-bd268e8e9466" xlink:to="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_18f454b0-a7dd-45d1-a26e-595967f924be" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:to="loc_srt_ConsolidatedEntitiesAxis_18f454b0-a7dd-45d1-a26e-595967f924be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_18f454b0-a7dd-45d1-a26e-595967f924be_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_18f454b0-a7dd-45d1-a26e-595967f924be" xlink:to="loc_srt_ConsolidatedEntitiesDomain_18f454b0-a7dd-45d1-a26e-595967f924be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_dd95b78f-62ad-4a41-82ae-785edb747178" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_18f454b0-a7dd-45d1-a26e-595967f924be" xlink:to="loc_srt_ConsolidatedEntitiesDomain_dd95b78f-62ad-4a41-82ae-785edb747178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_beecb9e3-d047-4cff-80b4-817f3801b71e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_dd95b78f-62ad-4a41-82ae-785edb747178" xlink:to="loc_srt_PartnershipInterestMember_beecb9e3-d047-4cff-80b4-817f3801b71e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_886c4b9e-d62e-4c1c-8a8e-1ec36765880b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_886c4b9e-d62e-4c1c-8a8e-1ec36765880b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_886c4b9e-d62e-4c1c-8a8e-1ec36765880b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_886c4b9e-d62e-4c1c-8a8e-1ec36765880b" xlink:to="loc_us-gaap_EquityComponentDomain_886c4b9e-d62e-4c1c-8a8e-1ec36765880b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_886c4b9e-d62e-4c1c-8a8e-1ec36765880b" xlink:to="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PreferredUnitsMember_aa4ce41e-0c9e-4391-b432-6427c1271c9d" xlink:href="frt-20221231.xsd#frt_PreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:to="loc_frt_PreferredUnitsMember_aa4ce41e-0c9e-4391-b432-6427c1271c9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonUnitsMember_793b78ce-1d6a-42b1-bcb2-7750c500e6a7" xlink:href="frt-20221231.xsd#frt_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:to="loc_frt_CommonUnitsMember_793b78ce-1d6a-42b1-bcb2-7750c500e6a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_2f51fdbe-ad92-4160-ab44-82499c4de7c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:to="loc_us-gaap_ParentMember_2f51fdbe-ad92-4160-ab44-82499c4de7c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NoncontrollingInterestsInConsolidatedPartnershipsMember_d505db4a-3e41-4113-906a-0ebdb9f8bc70" xlink:href="frt-20221231.xsd#frt_NoncontrollingInterestsInConsolidatedPartnershipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:to="loc_frt_NoncontrollingInterestsInConsolidatedPartnershipsMember_d505db4a-3e41-4113-906a-0ebdb9f8bc70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_cd28de08-4f89-4eaf-ac94-ec00b6d897ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_cd28de08-4f89-4eaf-ac94-ec00b6d897ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_6e904544-3386-4aeb-aa2a-3d28b033b7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:to="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_6e904544-3386-4aeb-aa2a-3d28b033b7a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_39cdd9be-701c-4294-85de-f507a3560bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d33f95a7-edd3-49e0-b253-ef9abef5189e" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_39cdd9be-701c-4294-85de-f507a3560bdb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_1f6483d7-7e81-45ec-bf81-e33a7b3b5196" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_1f6483d7-7e81-45ec-bf81-e33a7b3b5196" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_1f6483d7-7e81-45ec-bf81-e33a7b3b5196_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_1f6483d7-7e81-45ec-bf81-e33a7b3b5196" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_1f6483d7-7e81-45ec-bf81-e33a7b3b5196_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_6d8cf5bd-037c-473f-b601-b79de9fbf569" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_1f6483d7-7e81-45ec-bf81-e33a7b3b5196" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_6d8cf5bd-037c-473f-b601-b79de9fbf569" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_7800b9f8-e55a-4302-adee-3ef8c9bb4118" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:to="loc_srt_RestatementAxis_7800b9f8-e55a-4302-adee-3ef8c9bb4118" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_7800b9f8-e55a-4302-adee-3ef8c9bb4118_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_7800b9f8-e55a-4302-adee-3ef8c9bb4118" xlink:to="loc_srt_RestatementDomain_7800b9f8-e55a-4302-adee-3ef8c9bb4118_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_55cb976d-d594-45b0-a734-81d6c093990d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_7800b9f8-e55a-4302-adee-3ef8c9bb4118" xlink:to="loc_srt_RestatementDomain_55cb976d-d594-45b0-a734-81d6c093990d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_d79c8773-1c95-4261-b276-293bc8f8ed98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_d79c8773-1c95-4261-b276-293bc8f8ed98" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_d79c8773-1c95-4261-b276-293bc8f8ed98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_d79c8773-1c95-4261-b276-293bc8f8ed98" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_d79c8773-1c95-4261-b276-293bc8f8ed98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_d72893c9-4b12-42ab-8507-76a0c21dcc78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_d79c8773-1c95-4261-b276-293bc8f8ed98" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_d72893c9-4b12-42ab-8507-76a0c21dcc78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_e291339f-ca19-462b-a5f3-10485430a932" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_e291339f-ca19-462b-a5f3-10485430a932" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_e291339f-ca19-462b-a5f3-10485430a932_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_e291339f-ca19-462b-a5f3-10485430a932" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_e291339f-ca19-462b-a5f3-10485430a932_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_e776a9bf-4e6f-4b60-ae78-3bb0cc3fbc25" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_e291339f-ca19-462b-a5f3-10485430a932" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_e776a9bf-4e6f-4b60-ae78-3bb0cc3fbc25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeAxis_a873a3d0-a953-4512-8724-526e4cea93f8" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_5c431ac6-950e-4021-bc6c-083fae55461c" xlink:to="loc_frt_ConvertibleUnitTypeAxis_a873a3d0-a953-4512-8724-526e4cea93f8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeDomain_a873a3d0-a953-4512-8724-526e4cea93f8_default" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_ConvertibleUnitTypeAxis_a873a3d0-a953-4512-8724-526e4cea93f8" xlink:to="loc_frt_ConvertibleUnitTypeDomain_a873a3d0-a953-4512-8724-526e4cea93f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeDomain_54141aae-4c98-447e-950c-80e3ce51d533" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_ConvertibleUnitTypeAxis_a873a3d0-a953-4512-8724-526e4cea93f8" xlink:to="loc_frt_ConvertibleUnitTypeDomain_54141aae-4c98-447e-950c-80e3ce51d533" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DownREITOPUnitsMember_fa707dc4-6d8d-4db2-a5ef-c93a8c625b81" xlink:href="frt-20221231.xsd#frt_DownREITOPUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ConvertibleUnitTypeDomain_54141aae-4c98-447e-950c-80e3ce51d533" xlink:to="loc_frt_DownREITOPUnitsMember_fa707dc4-6d8d-4db2-a5ef-c93a8c625b81" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementsofCapitalParenthetical" xlink:type="simple" xlink:href="frt-20221231.xsd#ConsolidatedStatementsofCapitalParenthetical"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementsofCapitalParenthetical" xlink:type="extended" id="i5bcef87a4c5647f7910c3d9db0182d98_ConsolidatedStatementsofCapitalParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_9d3f57d2-1758-4f42-8f08-d2ef3e4197c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_0700d8d8-3428-4c9e-86dc-e989bc30634a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d3f57d2-1758-4f42-8f08-d2ef3e4197c8" xlink:to="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_0700d8d8-3428-4c9e-86dc-e989bc30634a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterest_8907931a-8549-4aa2-b782-1325663411bb" xlink:href="frt-20221231.xsd#frt_OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d3f57d2-1758-4f42-8f08-d2ef3e4197c8" xlink:to="loc_frt_OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterest_8907931a-8549-4aa2-b782-1325663411bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RedeemableNoncontrollingInterestDecreaseFromDistributionsToRedeemableNoncontrollingInterestHolders_dc004e4f-e861-422f-8172-145fb517b06a" xlink:href="frt-20221231.xsd#frt_RedeemableNoncontrollingInterestDecreaseFromDistributionsToRedeemableNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d3f57d2-1758-4f42-8f08-d2ef3e4197c8" xlink:to="loc_frt_RedeemableNoncontrollingInterestDecreaseFromDistributionsToRedeemableNoncontrollingInterestHolders_dc004e4f-e861-422f-8172-145fb517b06a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ContributionsFromRedeemableNoncontrollingInterests_6450f9e3-6251-46ab-8503-56eb402fc295" xlink:href="frt-20221231.xsd#frt_ContributionsFromRedeemableNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9d3f57d2-1758-4f42-8f08-d2ef3e4197c8" xlink:to="loc_frt_ContributionsFromRedeemableNoncontrollingInterests_6450f9e3-6251-46ab-8503-56eb402fc295" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_1acc6c08-3cd9-4d71-89da-aed49b3dbe1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_9d3f57d2-1758-4f42-8f08-d2ef3e4197c8" xlink:to="loc_us-gaap_StatementTable_1acc6c08-3cd9-4d71-89da-aed49b3dbe1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_ce54066a-f46d-400d-bc88-ed25ce4aaa9e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1acc6c08-3cd9-4d71-89da-aed49b3dbe1e" xlink:to="loc_srt_ConsolidatedEntitiesAxis_ce54066a-f46d-400d-bc88-ed25ce4aaa9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_ce54066a-f46d-400d-bc88-ed25ce4aaa9e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_ce54066a-f46d-400d-bc88-ed25ce4aaa9e" xlink:to="loc_srt_ConsolidatedEntitiesDomain_ce54066a-f46d-400d-bc88-ed25ce4aaa9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_9bc25de8-bf2d-46f6-933b-9c82709a9c90" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_ce54066a-f46d-400d-bc88-ed25ce4aaa9e" xlink:to="loc_srt_ConsolidatedEntitiesDomain_9bc25de8-bf2d-46f6-933b-9c82709a9c90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_f62bb1b0-2ad3-4b57-b861-c8c3852134b7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_9bc25de8-bf2d-46f6-933b-9c82709a9c90" xlink:to="loc_srt_PartnershipInterestMember_f62bb1b0-2ad3-4b57-b861-c8c3852134b7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesRealEstateDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SummaryOfSignificantAccountingPoliciesRealEstateDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesRealEstateDetails" xlink:type="extended" id="i055bebf32acd40fdbb1131a6fcc85005_SummaryOfSignificantAccountingPoliciesRealEstateDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c88ecaf7-57fc-4703-99ee-23e345338acd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_14c7d669-5842-42dd-89d2-be82db33903c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c88ecaf7-57fc-4703-99ee-23e345338acd" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_14c7d669-5842-42dd-89d2-be82db33903c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DepreciationExpenseRealEstate_7dee5c8b-5f0e-425e-947b-6b3edd08da5d" xlink:href="frt-20221231.xsd#frt_DepreciationExpenseRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c88ecaf7-57fc-4703-99ee-23e345338acd" xlink:to="loc_frt_DepreciationExpenseRealEstate_7dee5c8b-5f0e-425e-947b-6b3edd08da5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_45b29097-eabf-4414-8622-4e99c1a24a08" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c88ecaf7-57fc-4703-99ee-23e345338acd" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_45b29097-eabf-4414-8622-4e99c1a24a08" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_196077ac-8dad-4fc3-a2e1-63a398ec9b60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_45b29097-eabf-4414-8622-4e99c1a24a08" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_196077ac-8dad-4fc3-a2e1-63a398ec9b60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_196077ac-8dad-4fc3-a2e1-63a398ec9b60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_196077ac-8dad-4fc3-a2e1-63a398ec9b60" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_196077ac-8dad-4fc3-a2e1-63a398ec9b60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4d1bd56f-889e-4a7b-9341-9983e02a157c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_196077ac-8dad-4fc3-a2e1-63a398ec9b60" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4d1bd56f-889e-4a7b-9341-9983e02a157c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_c5a333c9-50d6-441a-91b8-13c5b9ae47af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4d1bd56f-889e-4a7b-9341-9983e02a157c" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_c5a333c9-50d6-441a-91b8-13c5b9ae47af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MinorImprovementsFurnitureAndEquipmentMember_ad3b61c1-9381-4976-8c4b-1729fe93dad8" xlink:href="frt-20221231.xsd#frt_MinorImprovementsFurnitureAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4d1bd56f-889e-4a7b-9341-9983e02a157c" xlink:to="loc_frt_MinorImprovementsFurnitureAndEquipmentMember_ad3b61c1-9381-4976-8c4b-1729fe93dad8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_915cae78-010a-4771-b296-5c12ae1ef007" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_45b29097-eabf-4414-8622-4e99c1a24a08" xlink:to="loc_srt_RangeAxis_915cae78-010a-4771-b296-5c12ae1ef007" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_915cae78-010a-4771-b296-5c12ae1ef007_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_915cae78-010a-4771-b296-5c12ae1ef007" xlink:to="loc_srt_RangeMember_915cae78-010a-4771-b296-5c12ae1ef007_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_eb5df15b-ed98-435c-b869-0591a191359d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_915cae78-010a-4771-b296-5c12ae1ef007" xlink:to="loc_srt_RangeMember_eb5df15b-ed98-435c-b869-0591a191359d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_bd047f70-313c-4018-85b9-8cfad4a5ae64" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_eb5df15b-ed98-435c-b869-0591a191359d" xlink:to="loc_srt_MinimumMember_bd047f70-313c-4018-85b9-8cfad4a5ae64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_7e8c1b82-ca7e-4ca8-9046-9d8fa2d48736" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_eb5df15b-ed98-435c-b869-0591a191359d" xlink:to="loc_srt_MaximumMember_7e8c1b82-ca7e-4ca8-9046-9d8fa2d48736" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesPrepaidExpensesandOtherAssetsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SummaryOfSignificantAccountingPoliciesPrepaidExpensesandOtherAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesPrepaidExpensesandOtherAssetsDetails" xlink:type="extended" id="i19a15426d6cb481d9e3dc1dfaa4ade90_SummaryOfSignificantAccountingPoliciesPrepaidExpensesandOtherAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_frt_PrepaidExpensesAndOtherAssetsLineItems_8b1a45a9-501b-4e68-b6af-76e451e9ad5e" xlink:href="frt-20221231.xsd#frt_PrepaidExpensesAndOtherAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CapitalizedLeaseCostsAmortizationRange_3eb77b7e-0aef-4f4d-8d2c-699784d44790" xlink:href="frt-20221231.xsd#frt_CapitalizedLeaseCostsAmortizationRange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_PrepaidExpensesAndOtherAssetsLineItems_8b1a45a9-501b-4e68-b6af-76e451e9ad5e" xlink:to="loc_frt_CapitalizedLeaseCostsAmortizationRange_3eb77b7e-0aef-4f4d-8d2c-699784d44790" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PrepaidExpensesAndOtherAssetsTable_7b085171-3f84-4b13-ba1c-df1c2e3cbf05" xlink:href="frt-20221231.xsd#frt_PrepaidExpensesAndOtherAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_frt_PrepaidExpensesAndOtherAssetsLineItems_8b1a45a9-501b-4e68-b6af-76e451e9ad5e" xlink:to="loc_frt_PrepaidExpensesAndOtherAssetsTable_7b085171-3f84-4b13-ba1c-df1c2e3cbf05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3ee498bf-d1b1-410f-92ba-731316cbcd14" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_PrepaidExpensesAndOtherAssetsTable_7b085171-3f84-4b13-ba1c-df1c2e3cbf05" xlink:to="loc_srt_RangeAxis_3ee498bf-d1b1-410f-92ba-731316cbcd14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3ee498bf-d1b1-410f-92ba-731316cbcd14_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3ee498bf-d1b1-410f-92ba-731316cbcd14" xlink:to="loc_srt_RangeMember_3ee498bf-d1b1-410f-92ba-731316cbcd14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_437a7254-1d07-4afb-92e6-b85fbc1530f6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3ee498bf-d1b1-410f-92ba-731316cbcd14" xlink:to="loc_srt_RangeMember_437a7254-1d07-4afb-92e6-b85fbc1530f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_8eec460c-014c-4029-a01c-026f345f322e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_437a7254-1d07-4afb-92e6-b85fbc1530f6" xlink:to="loc_srt_MinimumMember_8eec460c-014c-4029-a01c-026f345f322e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_30bc43a9-d90b-4b5a-aefb-8e7d15adcf5e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_437a7254-1d07-4afb-92e6-b85fbc1530f6" xlink:to="loc_srt_MaximumMember_30bc43a9-d90b-4b5a-aefb-8e7d15adcf5e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesDerivativeInstrumentsandMortgageNotesReceivableDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SummaryOfSignificantAccountingPoliciesDerivativeInstrumentsandMortgageNotesReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesDerivativeInstrumentsandMortgageNotesReceivableDetails" xlink:type="extended" id="i8c725b2f31d548a2973d26008445114a_SummaryOfSignificantAccountingPoliciesDerivativeInstrumentsandMortgageNotesReceivableDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_92772e0c-8ac8-446b-9533-29d1bb3ffbb4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_acfed8ea-d54f-4ba4-9859-fda8305b97a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfInterestRateDerivativesHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_92772e0c-8ac8-446b-9533-29d1bb3ffbb4" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_acfed8ea-d54f-4ba4-9859-fda8305b97a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_af5cf141-6f9b-4ec0-a15c-5a7343eb6a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_92772e0c-8ac8-446b-9533-29d1bb3ffbb4" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_af5cf141-6f9b-4ec0-a15c-5a7343eb6a0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNumberOfLoans_e5ea0d66-65ab-4478-904e-1a054f213f47" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateNumberOfLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_92772e0c-8ac8-446b-9533-29d1bb3ffbb4" xlink:to="loc_srt_MortgageLoansOnRealEstateNumberOfLoans_e5ea0d66-65ab-4478-904e-1a054f213f47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_e37a4e64-5e86-40a9-b6cf-c6c66aec8d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_92772e0c-8ac8-446b-9533-29d1bb3ffbb4" xlink:to="loc_us-gaap_NotesReceivableNet_e37a4e64-5e86-40a9-b6cf-c6c66aec8d0c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WeightedAverageInterestRateonFinancingReceivable_325b4d85-d931-4634-86fb-c4f5313ea55e" xlink:href="frt-20221231.xsd#frt_WeightedAverageInterestRateonFinancingReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_92772e0c-8ac8-446b-9533-29d1bb3ffbb4" xlink:to="loc_frt_WeightedAverageInterestRateonFinancingReceivable_325b4d85-d931-4634-86fb-c4f5313ea55e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_d7c2b75a-2338-43e3-86e8-fd8f49f9cf5c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_92772e0c-8ac8-446b-9533-29d1bb3ffbb4" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_d7c2b75a-2338-43e3-86e8-fd8f49f9cf5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e6d05a1c-1e9d-4286-8a7c-bf9af3f33d7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_d7c2b75a-2338-43e3-86e8-fd8f49f9cf5c" xlink:to="loc_us-gaap_DebtInstrumentAxis_e6d05a1c-1e9d-4286-8a7c-bf9af3f33d7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e6d05a1c-1e9d-4286-8a7c-bf9af3f33d7d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e6d05a1c-1e9d-4286-8a7c-bf9af3f33d7d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e6d05a1c-1e9d-4286-8a7c-bf9af3f33d7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_5017412a-0c16-4a27-b0ec-2cd6e243d681" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e6d05a1c-1e9d-4286-8a7c-bf9af3f33d7d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_5017412a-0c16-4a27-b0ec-2cd6e243d681" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HobokenMember_57dc59fd-0b83-4f0d-be7a-d42a57f2fbfe" xlink:href="frt-20221231.xsd#frt_HobokenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_5017412a-0c16-4a27-b0ec-2cd6e243d681" xlink:to="loc_frt_HobokenMember_57dc59fd-0b83-4f0d-be7a-d42a57f2fbfe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_86f93aca-a9c0-4714-bd0c-7deef34665aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_d7c2b75a-2338-43e3-86e8-fd8f49f9cf5c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_86f93aca-a9c0-4714-bd0c-7deef34665aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_86f93aca-a9c0-4714-bd0c-7deef34665aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_86f93aca-a9c0-4714-bd0c-7deef34665aa" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_86f93aca-a9c0-4714-bd0c-7deef34665aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_85fae18d-5f04-4cdb-94d5-c57a624d638a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_86f93aca-a9c0-4714-bd0c-7deef34665aa" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_85fae18d-5f04-4cdb-94d5-c57a624d638a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_dc7b9500-ed1f-4bbe-94e0-b48342da5315" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_85fae18d-5f04-4cdb-94d5-c57a624d638a" xlink:to="loc_us-gaap_SecuredDebtMember_dc7b9500-ed1f-4bbe-94e0-b48342da5315" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb36d5e1-f730-428a-9a17-3147516c4240" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_d7c2b75a-2338-43e3-86e8-fd8f49f9cf5c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb36d5e1-f730-428a-9a17-3147516c4240" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_fb36d5e1-f730-428a-9a17-3147516c4240_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb36d5e1-f730-428a-9a17-3147516c4240" xlink:to="loc_us-gaap_RelatedPartyDomain_fb36d5e1-f730-428a-9a17-3147516c4240_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_849cb0cd-41de-4bba-af0a-00983b2ac75a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb36d5e1-f730-428a-9a17-3147516c4240" xlink:to="loc_us-gaap_RelatedPartyDomain_849cb0cd-41de-4bba-af0a-00983b2ac75a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_52752af9-a70b-4389-8a83-bb5f83a07da3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_849cb0cd-41de-4bba-af0a-00983b2ac75a" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_52752af9-a70b-4389-8a83-bb5f83a07da3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b55a030d-1ceb-408c-a8cb-8fc6705dbb99" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_d7c2b75a-2338-43e3-86e8-fd8f49f9cf5c" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b55a030d-1ceb-408c-a8cb-8fc6705dbb99" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_b55a030d-1ceb-408c-a8cb-8fc6705dbb99_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b55a030d-1ceb-408c-a8cb-8fc6705dbb99" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_b55a030d-1ceb-408c-a8cb-8fc6705dbb99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5cf3becf-2a2f-4fa8-b04f-7e4dc125ad49" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b55a030d-1ceb-408c-a8cb-8fc6705dbb99" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5cf3becf-2a2f-4fa8-b04f-7e4dc125ad49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HobokenProvidentMember_f82bdb37-9939-481d-ae22-b86149ca42d2" xlink:href="frt-20221231.xsd#frt_HobokenProvidentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5cf3becf-2a2f-4fa8-b04f-7e4dc125ad49" xlink:to="loc_frt_HobokenProvidentMember_f82bdb37-9939-481d-ae22-b86149ca42d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AssemblyRowHotelMember_31ec02ad-1173-454c-a38c-ce41392fe82f" xlink:href="frt-20221231.xsd#frt_AssemblyRowHotelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_5cf3becf-2a2f-4fa8-b04f-7e4dc125ad49" xlink:to="loc_frt_AssemblyRowHotelMember_31ec02ad-1173-454c-a38c-ce41392fe82f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesVariableInterestEntitiesDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SummaryOfSignificantAccountingPoliciesVariableInterestEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesVariableInterestEntitiesDetails" xlink:type="extended" id="i59bc431a09d941b2bf21f2113f74c49d_SummaryOfSignificantAccountingPoliciesVariableInterestEntitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_ad260620-e914-4a6b-9706-602f1ce453a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_fea7cc74-f4b9-44ea-a444-769040eb0788" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_ad260620-e914-4a6b-9706-602f1ce453a6" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_fea7cc74-f4b9-44ea-a444-769040eb0788" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NumberofConsolidatedVariableInterestEntities_c33edb45-e63b-4594-984e-c2f4666672a6" xlink:href="frt-20221231.xsd#frt_NumberofConsolidatedVariableInterestEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_ad260620-e914-4a6b-9706-602f1ce453a6" xlink:to="loc_frt_NumberofConsolidatedVariableInterestEntities_c33edb45-e63b-4594-984e-c2f4666672a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_VariableInterestEntityNetRealEstateAssets_31630dfd-7b4c-4841-857e-f453b815844e" xlink:href="frt-20221231.xsd#frt_VariableInterestEntityNetRealEstateAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_ad260620-e914-4a6b-9706-602f1ce453a6" xlink:to="loc_frt_VariableInterestEntityNetRealEstateAssets_31630dfd-7b4c-4841-857e-f453b815844e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MortgagePayableFromConsolidatedVariableInterestEntities_bf3794b6-cac0-4694-989d-11c203b45834" xlink:href="frt-20221231.xsd#frt_MortgagePayableFromConsolidatedVariableInterestEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_ad260620-e914-4a6b-9706-602f1ce453a6" xlink:to="loc_frt_MortgagePayableFromConsolidatedVariableInterestEntities_bf3794b6-cac0-4694-989d-11c203b45834" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_78214573-bbb3-487c-b04b-770cfe88d890" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_ad260620-e914-4a6b-9706-602f1ce453a6" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_78214573-bbb3-487c-b04b-770cfe88d890" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1cc57ee2-bbeb-4270-9fb3-834a2be637fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_ad260620-e914-4a6b-9706-602f1ce453a6" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1cc57ee2-bbeb-4270-9fb3-834a2be637fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesAxis_5b9bcc66-d61a-4358-9cd8-e7714e014180" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstatePropertiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1cc57ee2-bbeb-4270-9fb3-834a2be637fb" xlink:to="loc_us-gaap_RealEstatePropertiesAxis_5b9bcc66-d61a-4358-9cd8-e7714e014180" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesDomain_5b9bcc66-d61a-4358-9cd8-e7714e014180_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstatePropertiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RealEstatePropertiesAxis_5b9bcc66-d61a-4358-9cd8-e7714e014180" xlink:to="loc_us-gaap_RealEstatePropertiesDomain_5b9bcc66-d61a-4358-9cd8-e7714e014180_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesDomain_c0e314f5-0be6-41ba-9396-049e107c4253" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstatePropertiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RealEstatePropertiesAxis_5b9bcc66-d61a-4358-9cd8-e7714e014180" xlink:to="loc_us-gaap_RealEstatePropertiesDomain_c0e314f5-0be6-41ba-9396-049e107c4253" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconsolidatedPropertiesMember_dbc298c6-0de1-42fd-b305-b69082fc607b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnconsolidatedPropertiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_c0e314f5-0be6-41ba-9396-049e107c4253" xlink:to="loc_us-gaap_UnconsolidatedPropertiesMember_dbc298c6-0de1-42fd-b305-b69082fc607b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b3edf0c5-16b5-4b1b-a89d-0ef0da96b883" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1cc57ee2-bbeb-4270-9fb3-834a2be637fb" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b3edf0c5-16b5-4b1b-a89d-0ef0da96b883" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_b3edf0c5-16b5-4b1b-a89d-0ef0da96b883_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b3edf0c5-16b5-4b1b-a89d-0ef0da96b883" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_b3edf0c5-16b5-4b1b-a89d-0ef0da96b883_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_d5e416f1-503e-464f-b527-dac201faf5ff" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_b3edf0c5-16b5-4b1b-a89d-0ef0da96b883" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_d5e416f1-503e-464f-b527-dac201faf5ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EquityMethodJointVenturesMember_d952aaab-945f-4dc3-b29f-08c1176d5928" xlink:href="frt-20221231.xsd#frt_EquityMethodJointVenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_d5e416f1-503e-464f-b527-dac201faf5ff" xlink:to="loc_frt_EquityMethodJointVenturesMember_d952aaab-945f-4dc3-b29f-08c1176d5928" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_ac466912-295a-430e-bbbb-14a709ad63de" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1cc57ee2-bbeb-4270-9fb3-834a2be637fb" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_ac466912-295a-430e-bbbb-14a709ad63de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_ac466912-295a-430e-bbbb-14a709ad63de_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_ac466912-295a-430e-bbbb-14a709ad63de" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_ac466912-295a-430e-bbbb-14a709ad63de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_440c1152-6360-4a01-addd-1c56e2d01139" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_ac466912-295a-430e-bbbb-14a709ad63de" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_440c1152-6360-4a01-addd-1c56e2d01139" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EscondidoPromenadeMember_c7f5f6bb-38ee-48f6-9ab4-9e62430e55a5" xlink:href="frt-20221231.xsd#frt_EscondidoPromenadeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_440c1152-6360-4a01-addd-1c56e2d01139" xlink:to="loc_frt_EscondidoPromenadeMember_c7f5f6bb-38ee-48f6-9ab4-9e62430e55a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_27f77f0f-3bc7-404b-83b9-3ecf3f415f00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_1cc57ee2-bbeb-4270-9fb3-834a2be637fb" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_27f77f0f-3bc7-404b-83b9-3ecf3f415f00" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_27f77f0f-3bc7-404b-83b9-3ecf3f415f00_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_27f77f0f-3bc7-404b-83b9-3ecf3f415f00" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_27f77f0f-3bc7-404b-83b9-3ecf3f415f00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_44b4116e-be8d-4298-b751-8f70f4e2b078" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_27f77f0f-3bc7-404b-83b9-3ecf3f415f00" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_44b4116e-be8d-4298-b751-8f70f4e2b078" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TICInterestMember_7bfaf955-d0ad-4731-aea0-c18b4f0c19df" xlink:href="frt-20221231.xsd#frt_TICInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_44b4116e-be8d-4298-b751-8f70f4e2b078" xlink:to="loc_frt_TICInterestMember_7bfaf955-d0ad-4731-aea0-c18b4f0c19df" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesRedeemableNoncontrollingInterestsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SummaryOfSignificantAccountingPoliciesRedeemableNoncontrollingInterestsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesRedeemableNoncontrollingInterestsDetails" xlink:type="extended" id="iab3b6e5c1d6e44c0a5dc87334338cfbe_SummaryOfSignificantAccountingPoliciesRedeemableNoncontrollingInterestsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestLineItems_6735cbae-ad5d-456e-aab0-1149ce2f1325" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_6735cbae-ad5d-456e-aab0-1149ce2f1325" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_7242e275-4e89-4909-9c16-b4ce1c0ef8d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_7242e275-4e89-4909-9c16-b4ce1c0ef8d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ContributionsFromRedeemableNoncontrollingInterests_34904cbd-e2d7-4bb4-b67c-3c8f3ae01949" xlink:href="frt-20221231.xsd#frt_ContributionsFromRedeemableNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:to="loc_frt_ContributionsFromRedeemableNoncontrollingInterests_34904cbd-e2d7-4bb4-b67c-3c8f3ae01949" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_f217b24c-f0ef-44f5-9165-42614dde66cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:to="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_f217b24c-f0ef-44f5-9165-42614dde66cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterests_d5bd2d58-e933-449a-8961-0706ff33beb0" xlink:href="frt-20221231.xsd#frt_OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:to="loc_frt_OtherComprehensiveIncomeLossAttributableToRedeemableNoncontrollingInterests_d5bd2d58-e933-449a-8961-0706ff33beb0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RedeemableNoncontrollingInterestDecreaseFromDistributionsAndPurchasesToRedeemableNoncontrollingInterestHolders_64413a8a-cd61-4827-b263-680471b4e54f" xlink:href="frt-20221231.xsd#frt_RedeemableNoncontrollingInterestDecreaseFromDistributionsAndPurchasesToRedeemableNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:to="loc_frt_RedeemableNoncontrollingInterestDecreaseFromDistributionsAndPurchasesToRedeemableNoncontrollingInterestHolders_64413a8a-cd61-4827-b263-680471b4e54f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityOtherChanges_d3fb2098-f5f7-49e0-9e4f-07b5af518771" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TemporaryEquityOtherChanges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_1c61ab33-3c93-480e-a4d2-2aa795cbc7d6" xlink:to="loc_us-gaap_TemporaryEquityOtherChanges_d3fb2098-f5f7-49e0-9e4f-07b5af518771" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_003c965e-d251-4719-95be-fc44a89d7f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OwnershipInterestSubsequentToRedemption_108805be-6c5f-4002-9a80-1d58817495c8" xlink:href="frt-20221231.xsd#frt_OwnershipInterestSubsequentToRedemption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_6735cbae-ad5d-456e-aab0-1149ce2f1325" xlink:to="loc_frt_OwnershipInterestSubsequentToRedemption_108805be-6c5f-4002-9a80-1d58817495c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_fb354792-fc7e-474c-a194-e4310ee85298" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_6735cbae-ad5d-456e-aab0-1149ce2f1325" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_fb354792-fc7e-474c-a194-e4310ee85298" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_d4cf58df-94a7-42f8-b4ba-e8bae1c2c9f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_6735cbae-ad5d-456e-aab0-1149ce2f1325" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_d4cf58df-94a7-42f8-b4ba-e8bae1c2c9f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestTable_b6505b9c-f855-4e33-9b37-a93303bc664b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MinorityInterestLineItems_6735cbae-ad5d-456e-aab0-1149ce2f1325" xlink:to="loc_us-gaap_MinorityInterestTable_b6505b9c-f855-4e33-9b37-a93303bc664b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_6933c6b7-a4c5-4510-8ebf-03f97e07a3df" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MinorityInterestTable_b6505b9c-f855-4e33-9b37-a93303bc664b" xlink:to="loc_srt_OwnershipAxis_6933c6b7-a4c5-4510-8ebf-03f97e07a3df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_6933c6b7-a4c5-4510-8ebf-03f97e07a3df_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_6933c6b7-a4c5-4510-8ebf-03f97e07a3df" xlink:to="loc_srt_OwnershipDomain_6933c6b7-a4c5-4510-8ebf-03f97e07a3df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_1ff02eaf-c73d-4ea3-9981-f6b0b3034ccf" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_6933c6b7-a4c5-4510-8ebf-03f97e07a3df" xlink:to="loc_srt_OwnershipDomain_1ff02eaf-c73d-4ea3-9981-f6b0b3034ccf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RedeemableNoncontrollingInterestsMember_685a171d-6518-4364-a3d7-5d717d00393d" xlink:href="frt-20221231.xsd#frt_RedeemableNoncontrollingInterestsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_1ff02eaf-c73d-4ea3-9981-f6b0b3034ccf" xlink:to="loc_frt_RedeemableNoncontrollingInterestsMember_685a171d-6518-4364-a3d7-5d717d00393d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_efdcafde-a25b-4e1a-95e9-b570b6d91fed" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MinorityInterestTable_b6505b9c-f855-4e33-9b37-a93303bc664b" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_efdcafde-a25b-4e1a-95e9-b570b6d91fed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_efdcafde-a25b-4e1a-95e9-b570b6d91fed_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_efdcafde-a25b-4e1a-95e9-b570b6d91fed" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_efdcafde-a25b-4e1a-95e9-b570b6d91fed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a2fc35a1-3f2c-44aa-ac6b-cd93d956b769" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_efdcafde-a25b-4e1a-95e9-b570b6d91fed" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a2fc35a1-3f2c-44aa-ac6b-cd93d956b769" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PlazaElSegundoMember_e8aecceb-7453-4635-aaf2-e9ae6652b240" xlink:href="frt-20221231.xsd#frt_PlazaElSegundoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a2fc35a1-3f2c-44aa-ac6b-cd93d956b769" xlink:to="loc_frt_PlazaElSegundoMember_e8aecceb-7453-4635-aaf2-e9ae6652b240" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesIncomeTaxesSegmentsForwardEquitySalesandRecentAccountingPronouncementsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SummaryOfSignificantAccountingPoliciesIncomeTaxesSegmentsForwardEquitySalesandRecentAccountingPronouncementsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesIncomeTaxesSegmentsForwardEquitySalesandRecentAccountingPronouncementsDetails" xlink:type="extended" id="ic7c491fd9cda41bfb7e6b876fa7d6b95_SummaryOfSignificantAccountingPoliciesIncomeTaxesSegmentsForwardEquitySalesandRecentAccountingPronouncementsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_ed5c4f66-2ba6-490f-89d8-1ccbe1de066a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_us-gaap_NumberOfReportableSegments_ed5c4f66-2ba6-490f-89d8-1ccbe1de066a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FactorsUsedToIdentifyEntitysReportableSegments_ca13a4c0-eb23-4f42-8d4e-1c45254bc300" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FactorsUsedToIdentifyEntitysReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_us-gaap_FactorsUsedToIdentifyEntitysReportableSegments_ca13a4c0-eb23-4f42-8d4e-1c45254bc300" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NumberofPropertiesExceedingSegmentReportingThreshold_9ab5212e-aa1a-4c1d-84ae-3700c3d05dba" xlink:href="frt-20221231.xsd#frt_NumberofPropertiesExceedingSegmentReportingThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_frt_NumberofPropertiesExceedingSegmentReportingThreshold_9ab5212e-aa1a-4c1d-84ae-3700c3d05dba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_021598bc-9498-48ec-98c1-8fbfcc5895c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_021598bc-9498-48ec-98c1-8fbfcc5895c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MinimumPercentageOfTaxableIncomeDistributedToShareholders_71c173fc-1979-413e-9221-d3113145a044" xlink:href="frt-20221231.xsd#frt_MinimumPercentageOfTaxableIncomeDistributedToShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_frt_MinimumPercentageOfTaxableIncomeDistributedToShareholders_71c173fc-1979-413e-9221-d3113145a044" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_ef4ddb95-04ee-4d04-b65e-c4e3ec12040d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_ef4ddb95-04ee-4d04-b65e-c4e3ec12040d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MortgageLoanOnUnconsolidatedRealEstateProperty_07029862-fe8e-4c3e-b473-c40df1daf749" xlink:href="frt-20221231.xsd#frt_MortgageLoanOnUnconsolidatedRealEstateProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_frt_MortgageLoanOnUnconsolidatedRealEstateProperty_07029862-fe8e-4c3e-b473-c40df1daf749" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OurShareOfUnconsolidatedMortgageDebt_5de53d6b-0e43-4673-8c0c-6327c54f9cdc" xlink:href="frt-20221231.xsd#frt_OurShareOfUnconsolidatedMortgageDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_frt_OurShareOfUnconsolidatedMortgageDebt_5de53d6b-0e43-4673-8c0c-6327c54f9cdc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0ee5e342-6bea-4098-9a95-e1eec35c58ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_f8d11b6a-6d0c-4181-997b-5c9a66739f60" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0ee5e342-6bea-4098-9a95-e1eec35c58ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_1fd6bb0b-ee84-49ea-9d2e-59ad17d90a80" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0ee5e342-6bea-4098-9a95-e1eec35c58ac" xlink:to="loc_us-gaap_DebtInstrumentAxis_1fd6bb0b-ee84-49ea-9d2e-59ad17d90a80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1fd6bb0b-ee84-49ea-9d2e-59ad17d90a80_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1fd6bb0b-ee84-49ea-9d2e-59ad17d90a80" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1fd6bb0b-ee84-49ea-9d2e-59ad17d90a80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d4ce5a55-5d92-4a52-8661-bb17cc2f750e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1fd6bb0b-ee84-49ea-9d2e-59ad17d90a80" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d4ce5a55-5d92-4a52-8661-bb17cc2f750e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HobokenProvidentBankMember_b880f416-d305-449a-9987-b64c89cf960b" xlink:href="frt-20221231.xsd#frt_HobokenProvidentBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d4ce5a55-5d92-4a52-8661-bb17cc2f750e" xlink:to="loc_frt_HobokenProvidentBankMember_b880f416-d305-449a-9987-b64c89cf960b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_bd369757-eb8b-4325-a4c5-cfa4cb9575a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0ee5e342-6bea-4098-9a95-e1eec35c58ac" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_bd369757-eb8b-4325-a4c5-cfa4cb9575a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_bd369757-eb8b-4325-a4c5-cfa4cb9575a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_bd369757-eb8b-4325-a4c5-cfa4cb9575a5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_bd369757-eb8b-4325-a4c5-cfa4cb9575a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fd63e5cb-cdfd-4b1a-91d6-3cd155df8a92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_bd369757-eb8b-4325-a4c5-cfa4cb9575a5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fd63e5cb-cdfd-4b1a-91d6-3cd155df8a92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_31ce3290-0eb1-4993-ba95-a6433e282627" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fd63e5cb-cdfd-4b1a-91d6-3cd155df8a92" xlink:to="loc_us-gaap_SecuredDebtMember_31ce3290-0eb1-4993-ba95-a6433e282627" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3a62b5e-2326-4f7f-b144-0af3896ed802" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_0ee5e342-6bea-4098-9a95-e1eec35c58ac" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3a62b5e-2326-4f7f-b144-0af3896ed802" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_f3a62b5e-2326-4f7f-b144-0af3896ed802_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3a62b5e-2326-4f7f-b144-0af3896ed802" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_f3a62b5e-2326-4f7f-b144-0af3896ed802_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_bc8051f0-d18d-458d-be39-67c2d05c5bff" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_f3a62b5e-2326-4f7f-b144-0af3896ed802" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_bc8051f0-d18d-458d-be39-67c2d05c5bff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AssemblyRowHotelMember_1874d0bd-a443-41e4-9391-d85d9b005b6c" xlink:href="frt-20221231.xsd#frt_AssemblyRowHotelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_bc8051f0-d18d-458d-be39-67c2d05c5bff" xlink:to="loc_frt_AssemblyRowHotelMember_1874d0bd-a443-41e4-9391-d85d9b005b6c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesSupplementalCashFlowDisclosuresDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SummaryOfSignificantAccountingPoliciesSupplementalCashFlowDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesSupplementalCashFlowDisclosuresDetails" xlink:type="extended" id="ia2f961858adc402788f6e1d0d584b96a_SummaryOfSignificantAccountingPoliciesSupplementalCashFlowDisclosuresDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_6e44c9e6-191f-475b-aa6f-eadedf903467" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_f8a5481b-4a00-4e3b-8339-d8f60dce1e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_6e44c9e6-191f-475b-aa6f-eadedf903467" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_f8a5481b-4a00-4e3b-8339-d8f60dce1e9d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2cd7edb8-464f-4def-8fb8-f570c2694648" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_f8a5481b-4a00-4e3b-8339-d8f60dce1e9d" xlink:to="loc_srt_RangeAxis_2cd7edb8-464f-4def-8fb8-f570c2694648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2cd7edb8-464f-4def-8fb8-f570c2694648_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2cd7edb8-464f-4def-8fb8-f570c2694648" xlink:to="loc_srt_RangeMember_2cd7edb8-464f-4def-8fb8-f570c2694648_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bba20c58-80e0-472a-ba03-073b6c87ef00" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2cd7edb8-464f-4def-8fb8-f570c2694648" xlink:to="loc_srt_RangeMember_bba20c58-80e0-472a-ba03-073b6c87ef00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_54975167-cc40-486d-8c55-da6885da3484" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bba20c58-80e0-472a-ba03-073b6c87ef00" xlink:to="loc_srt_MinimumMember_54975167-cc40-486d-8c55-da6885da3484" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2f7b751c-ff64-42ac-b504-b32803bfaade" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bba20c58-80e0-472a-ba03-073b6c87ef00" xlink:to="loc_srt_MaximumMember_2f7b751c-ff64-42ac-b504-b32803bfaade" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/RealEstate2022PropertyAcquisitionsandDispositionsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#RealEstate2022PropertyAcquisitionsandDispositionsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/RealEstate2022PropertyAcquisitionsandDispositionsDetails" xlink:type="extended" id="id9188f8f23a54006ae1747e191cf5413_RealEstate2022PropertyAcquisitionsandDispositionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AreaOfRealEstateProperty_ccbae4ed-2685-4907-a7ed-f5909d0d2d43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AreaOfRealEstateProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_AreaOfRealEstateProperty_ccbae4ed-2685-4907-a7ed-f5909d0d2d43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PurchasePriceOfFeeInterestInRealEstate_abecc82f-77e4-498c-8dc4-cb818dfc2dbb" xlink:href="frt-20221231.xsd#frt_PurchasePriceOfFeeInterestInRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_PurchasePriceOfFeeInterestInRealEstate_abecc82f-77e4-498c-8dc4-cb818dfc2dbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AcquiredLeaseCosts_442b030c-6d5a-451d-8ac8-e750fd3500fe" xlink:href="frt-20221231.xsd#frt_AcquiredLeaseCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_AcquiredLeaseCosts_442b030c-6d5a-451d-8ac8-e750fd3500fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_2d3ba29d-0f9c-4a3b-8baa-b34cfc542467" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_2d3ba29d-0f9c-4a3b-8baa-b34cfc542467" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAcquired_c9d6c73b-9d3a-4862-841b-8527257053ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_BelowMarketLeaseAcquired_c9d6c73b-9d3a-4862-841b-8527257053ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_b0f1b5e3-8096-441c-ace3-9804af776e39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_b0f1b5e3-8096-441c-ace3-9804af776e39" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AboveMarketLiability_bd5dbdd0-cb2e-49ef-9d73-b589a867860f" xlink:href="frt-20221231.xsd#frt_AboveMarketLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_AboveMarketLiability_bd5dbdd0-cb2e-49ef-9d73-b589a867860f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_58b00695-f405-4a79-818d-baa063eccf77" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_OperatingLeaseLiability_58b00695-f405-4a79-818d-baa063eccf77" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ControllingInterestPercent_ba823a45-7df4-4cc0-ac86-d66338f70ce7" xlink:href="frt-20221231.xsd#frt_ControllingInterestPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_ControllingInterestPercent_ba823a45-7df4-4cc0-ac86-d66338f70ce7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_ceb1450f-f259-4454-bf31-169b8704eca1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_ceb1450f-f259-4454-bf31-169b8704eca1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MortgageLoanOnUnconsolidatedRealEstateProperty_8b58e125-9d25-480b-9235-37134d9f9723" xlink:href="frt-20221231.xsd#frt_MortgageLoanOnUnconsolidatedRealEstateProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_MortgageLoanOnUnconsolidatedRealEstateProperty_8b58e125-9d25-480b-9235-37134d9f9723" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OurShareOfUnconsolidatedMortgageDebt_527f09e7-e0d2-4ddc-ab02-1254d7d94161" xlink:href="frt-20221231.xsd#frt_OurShareOfUnconsolidatedMortgageDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_OurShareOfUnconsolidatedMortgageDebt_527f09e7-e0d2-4ddc-ab02-1254d7d94161" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Salespriceofrealestate_541f7b49-dead-4f27-b080-123ba85fdae0" xlink:href="frt-20221231.xsd#frt_Salespriceofrealestate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_Salespriceofrealestate_541f7b49-dead-4f27-b080-123ba85fdae0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest_6c4f3698-e6da-4921-89ce-149ba60b6ac7" xlink:href="frt-20221231.xsd#frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_GainOnSaleOfRealEstateAndChangeInControlOfInterest_6c4f3698-e6da-4921-89ce-149ba60b6ac7" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OwnershipInterestOfPartnerInOurJointVenture_4a5be555-26ea-492a-a2a8-1ae07dc3cc32" xlink:href="frt-20221231.xsd#frt_OwnershipInterestOfPartnerInOurJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_OwnershipInterestOfPartnerInOurJointVenture_4a5be555-26ea-492a-a2a8-1ae07dc3cc32" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DeconsolidationOfVIEGainLossAmount_669b9039-cd1c-4ce9-bddd-3540cd5f80f5" xlink:href="frt-20221231.xsd#frt_DeconsolidationOfVIEGainLossAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_DeconsolidationOfVIEGainLossAmount_669b9039-cd1c-4ce9-bddd-3540cd5f80f5" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_37e20ff7-3366-4812-a3da-342a925fa0e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_37e20ff7-3366-4812-a3da-342a925fa0e0" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LoanToCoOwner_2840d811-c333-4302-9478-50ee03991beb" xlink:href="frt-20221231.xsd#frt_LoanToCoOwner"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_LoanToCoOwner_2840d811-c333-4302-9478-50ee03991beb" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PurchaseOptionAgreementPriceToAcquireTheTICInterestFromOurCoOwner_25898418-dc50-45ca-a1a4-acf6df44ca9c" xlink:href="frt-20221231.xsd#frt_PurchaseOptionAgreementPriceToAcquireTheTICInterestFromOurCoOwner"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_frt_PurchaseOptionAgreementPriceToAcquireTheTICInterestFromOurCoOwner_25898418-dc50-45ca-a1a4-acf6df44ca9c" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4fb32193-d07a-4057-8dd1-4b412fdfae16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0fb62c86-6f3b-4fd0-8c51-da1ed49bb590" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4fb32193-d07a-4057-8dd1-4b412fdfae16" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_6cc51c63-a7a4-44bf-8914-60286eb15054" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4fb32193-d07a-4057-8dd1-4b412fdfae16" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_6cc51c63-a7a4-44bf-8914-60286eb15054" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_6cc51c63-a7a4-44bf-8914-60286eb15054_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_6cc51c63-a7a4-44bf-8914-60286eb15054" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_6cc51c63-a7a4-44bf-8914-60286eb15054_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_6cc51c63-a7a4-44bf-8914-60286eb15054" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_KingstowneShoppingCenterMember_0efabe42-ef48-499e-ae5b-f5f994f8a2a5" xlink:href="frt-20221231.xsd#frt_KingstowneShoppingCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_KingstowneShoppingCenterMember_0efabe42-ef48-499e-ae5b-f5f994f8a2a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HiltonVillageOfficeMember_13fb2c4f-4f7b-4eb7-9894-1ca787ddc52d" xlink:href="frt-20221231.xsd#frt_HiltonVillageOfficeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_HiltonVillageOfficeMember_13fb2c4f-4f7b-4eb7-9894-1ca787ddc52d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShopsAtPembrokeGardensMember_da1e124f-087b-468e-b137-ffaff93c8244" xlink:href="frt-20221231.xsd#frt_ShopsAtPembrokeGardensMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_ShopsAtPembrokeGardensMember_da1e124f-087b-468e-b137-ffaff93c8244" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Hoboken301WashingtonStMember_78713922-3088-4251-a570-0d5e935e2847" xlink:href="frt-20221231.xsd#frt_Hoboken301WashingtonStMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_Hoboken301WashingtonStMember_78713922-3088-4251-a570-0d5e935e2847" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChandlerMember_6d0999dc-7d60-48b0-b0c0-d62a98fb468b" xlink:href="frt-20221231.xsd#frt_ChandlerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_ChandlerMember_6d0999dc-7d60-48b0-b0c0-d62a98fb468b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChandlerFestivalMember_191cdcff-68b5-4104-8d04-3f9ac4e74e5c" xlink:href="frt-20221231.xsd#frt_ChandlerFestivalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_ChandlerFestivalMember_191cdcff-68b5-4104-8d04-3f9ac4e74e5c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChandlerGatewayMember_12c34601-f790-484c-816c-d9f51d3668a3" xlink:href="frt-20221231.xsd#frt_ChandlerGatewayMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_ChandlerGatewayMember_12c34601-f790-484c-816c-d9f51d3668a3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ThreeProperties2022Member_cedb7a52-0cbc-4c03-a488-13cae823c2b0" xlink:href="frt-20221231.xsd#frt_ThreeProperties2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_ThreeProperties2022Member_cedb7a52-0cbc-4c03-a488-13cae823c2b0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EscondidoPromenadeMember_8cfb6743-cb90-4a78-8c58-ee17a50b7ce8" xlink:href="frt-20221231.xsd#frt_EscondidoPromenadeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a38a9bee-c8d4-4469-aac7-e031e7308ddf" xlink:to="loc_frt_EscondidoPromenadeMember_8cfb6743-cb90-4a78-8c58-ee17a50b7ce8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20e80ba1-04e7-49a3-8eb0-f4833d82012f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4fb32193-d07a-4057-8dd1-4b412fdfae16" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20e80ba1-04e7-49a3-8eb0-f4833d82012f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_20e80ba1-04e7-49a3-8eb0-f4833d82012f_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20e80ba1-04e7-49a3-8eb0-f4833d82012f" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_20e80ba1-04e7-49a3-8eb0-f4833d82012f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_e498e40d-81ad-48cc-8146-4602257943c4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20e80ba1-04e7-49a3-8eb0-f4833d82012f" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_e498e40d-81ad-48cc-8146-4602257943c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChandlerMember_08a0b3e2-eb5c-450d-93ae-22899f66b401" xlink:href="frt-20221231.xsd#frt_ChandlerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_e498e40d-81ad-48cc-8146-4602257943c4" xlink:to="loc_frt_ChandlerMember_08a0b3e2-eb5c-450d-93ae-22899f66b401" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EscondidoPromenadeMember_24989690-5835-4811-a663-ff4c51d93774" xlink:href="frt-20221231.xsd#frt_EscondidoPromenadeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_e498e40d-81ad-48cc-8146-4602257943c4" xlink:to="loc_frt_EscondidoPromenadeMember_24989690-5835-4811-a663-ff4c51d93774" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_62b6f8bf-68c3-492a-9599-a729c17ba17b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4fb32193-d07a-4057-8dd1-4b412fdfae16" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_62b6f8bf-68c3-492a-9599-a729c17ba17b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_62b6f8bf-68c3-492a-9599-a729c17ba17b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_62b6f8bf-68c3-492a-9599-a729c17ba17b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_62b6f8bf-68c3-492a-9599-a729c17ba17b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_0e9953da-eb88-45ec-8c83-79eaf169b625" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_62b6f8bf-68c3-492a-9599-a729c17ba17b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_0e9953da-eb88-45ec-8c83-79eaf169b625" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_48b1d102-fa03-4bef-93b9-d720ecbdf06b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0e9953da-eb88-45ec-8c83-79eaf169b625" xlink:to="loc_us-gaap_OtherAssetsMember_48b1d102-fa03-4bef-93b9-d720ecbdf06b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_dd795ddc-2977-4e87-b502-97c786a18b33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0e9953da-eb88-45ec-8c83-79eaf169b625" xlink:to="loc_us-gaap_OtherLiabilitiesMember_dd795ddc-2977-4e87-b502-97c786a18b33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_InvestmentInPartnershipsMember_13932318-0719-4990-8639-e3f0e2e4c18c" xlink:href="frt-20221231.xsd#frt_InvestmentInPartnershipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0e9953da-eb88-45ec-8c83-79eaf169b625" xlink:to="loc_frt_InvestmentInPartnershipsMember_13932318-0719-4990-8639-e3f0e2e4c18c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AccountsAndNotesReceivableNetMember_7a22fba3-f32f-4d57-a2e4-d251accf1d94" xlink:href="frt-20221231.xsd#frt_AccountsAndNotesReceivableNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0e9953da-eb88-45ec-8c83-79eaf169b625" xlink:to="loc_frt_AccountsAndNotesReceivableNetMember_7a22fba3-f32f-4d57-a2e4-d251accf1d94" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b5059231-26a0-45bd-b26d-25236d7e91fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4fb32193-d07a-4057-8dd1-4b412fdfae16" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b5059231-26a0-45bd-b26d-25236d7e91fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b5059231-26a0-45bd-b26d-25236d7e91fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b5059231-26a0-45bd-b26d-25236d7e91fb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b5059231-26a0-45bd-b26d-25236d7e91fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8ef8ba80-eb19-4b0a-92e8-0fad3cd7df56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b5059231-26a0-45bd-b26d-25236d7e91fb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8ef8ba80-eb19-4b0a-92e8-0fad3cd7df56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAcquiredInPlaceMember_41fc0e29-cb6d-444d-a518-51417603f92c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeasesAcquiredInPlaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8ef8ba80-eb19-4b0a-92e8-0fad3cd7df56" xlink:to="loc_us-gaap_LeasesAcquiredInPlaceMember_41fc0e29-cb6d-444d-a518-51417603f92c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AboveMarketLeasesMember_7335ba2a-bd68-489b-9f94-fa0d9094254a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AboveMarketLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8ef8ba80-eb19-4b0a-92e8-0fad3cd7df56" xlink:to="loc_us-gaap_AboveMarketLeasesMember_7335ba2a-bd68-489b-9f94-fa0d9094254a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_4bc51a12-37bf-467d-9650-f1c8b2190ec2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4fb32193-d07a-4057-8dd1-4b412fdfae16" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_4bc51a12-37bf-467d-9650-f1c8b2190ec2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_4bc51a12-37bf-467d-9650-f1c8b2190ec2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_4bc51a12-37bf-467d-9650-f1c8b2190ec2" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_4bc51a12-37bf-467d-9650-f1c8b2190ec2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_df86b06f-5f44-4734-b034-a26470aa1bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_4bc51a12-37bf-467d-9650-f1c8b2190ec2" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_df86b06f-5f44-4734-b034-a26470aa1bf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TICInterestMember_d2e4f69b-3265-4907-82fa-fa8e01257463" xlink:href="frt-20221231.xsd#frt_TICInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_df86b06f-5f44-4734-b034-a26470aa1bf2" xlink:to="loc_frt_TICInterestMember_d2e4f69b-3265-4907-82fa-fa8e01257463" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/RealEstate2021PropertyAcquisitionsandDispositionsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#RealEstate2021PropertyAcquisitionsandDispositionsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/RealEstate2021PropertyAcquisitionsandDispositionsDetails" xlink:type="extended" id="i3cae3c5509c64b86861b573bc08258cc_RealEstate2021PropertyAcquisitionsandDispositionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OwnershipInterestOfPartnerInOurJointVenture_d1eaaf50-678d-4160-a305-900d1ec2f05d" xlink:href="frt-20221231.xsd#frt_OwnershipInterestOfPartnerInOurJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_OwnershipInterestOfPartnerInOurJointVenture_d1eaaf50-678d-4160-a305-900d1ec2f05d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInterestInJointVenture_26fe7b28-af1f-408e-a43b-3ced715ccfd1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireInterestInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_PaymentsToAcquireInterestInJointVenture_26fe7b28-af1f-408e-a43b-3ced715ccfd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_e74c7620-c0d7-4664-b1e7-650f11e7abd9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_e74c7620-c0d7-4664-b1e7-650f11e7abd9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GainOnAcquisitionOfControllingInterest_9778d3c1-73fc-46ea-83ad-164e77b5a67e" xlink:href="frt-20221231.xsd#frt_GainOnAcquisitionOfControllingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_GainOnAcquisitionOfControllingInterest_9778d3c1-73fc-46ea-83ad-164e77b5a67e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PurchasePriceOfFeeInterestInRealEstate_c400a872-a08d-407f-818c-f2734cc161eb" xlink:href="frt-20221231.xsd#frt_PurchasePriceOfFeeInterestInRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_PurchasePriceOfFeeInterestInRealEstate_c400a872-a08d-407f-818c-f2734cc161eb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DecreaseInOperatingLeaseRightOfUseAssets_b1ec519a-581f-44bd-a0f3-7e06f65664e9" xlink:href="frt-20221231.xsd#frt_DecreaseInOperatingLeaseRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_DecreaseInOperatingLeaseRightOfUseAssets_b1ec519a-581f-44bd-a0f3-7e06f65664e9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_27a927e0-ead6-4be0-b894-38fe7ba147d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_27a927e0-ead6-4be0-b894-38fe7ba147d0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AreaOfRealEstateProperty_7e9e71da-37fd-406f-a41f-0bf59bb351a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AreaOfRealEstateProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_AreaOfRealEstateProperty_7e9e71da-37fd-406f-a41f-0bf59bb351a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ControllingInterestPercent_1494fc67-f3dc-43cd-87e6-dfe030c81ca0" xlink:href="frt-20221231.xsd#frt_ControllingInterestPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_ControllingInterestPercent_1494fc67-f3dc-43cd-87e6-dfe030c81ca0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GrossValueofRealEstate_916389ef-5b50-479f-b8b8-5497067f2f38" xlink:href="frt-20221231.xsd#frt_GrossValueofRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_GrossValueofRealEstate_916389ef-5b50-479f-b8b8-5497067f2f38" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AcquiredLeaseCosts_163cffac-bbd0-4475-a4f1-1ab8f06d6d4d" xlink:href="frt-20221231.xsd#frt_AcquiredLeaseCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_AcquiredLeaseCosts_163cffac-bbd0-4475-a4f1-1ab8f06d6d4d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_028bbc60-2ed8-4be0-a950-c5fba478c240" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_028bbc60-2ed8-4be0-a950-c5fba478c240" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAcquired_e75e7ad1-e246-4885-83a7-e340d0fd93d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_BelowMarketLeaseAcquired_e75e7ad1-e246-4885-83a7-e340d0fd93d6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_9bf18190-444a-4d1b-b538-8b79c7ae4b20" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_9bf18190-444a-4d1b-b538-8b79c7ae4b20" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AboveMarketLiability_7f93206e-23e8-4d0e-b2bd-26fb29d76866" xlink:href="frt-20221231.xsd#frt_AboveMarketLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_frt_AboveMarketLiability_7f93206e-23e8-4d0e-b2bd-26fb29d76866" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_d6c3f520-c937-4136-9061-a4ab9bf3903c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_OperatingLeaseLiability_d6c3f520-c937-4136-9061-a4ab9bf3903c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfRealEstate_31f25807-a824-44a6-90b1-b1ca3be4c371" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_ProceedsFromSaleOfRealEstate_31f25807-a824-44a6-90b1-b1ca3be4c371" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfProperties_27c67e02-1905-42e3-b095-8e227d979ac4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSaleOfProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_GainLossOnSaleOfProperties_27c67e02-1905-42e3-b095-8e227d979ac4" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_725c6a81-64fd-4d93-b310-0de6a7841cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_48e60c48-3452-4eeb-857e-aae412fc69e9" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_725c6a81-64fd-4d93-b310-0de6a7841cf6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3c16f21f-8bfe-40d8-a8df-80bf01c99e1c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_725c6a81-64fd-4d93-b310-0de6a7841cf6" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3c16f21f-8bfe-40d8-a8df-80bf01c99e1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_3c16f21f-8bfe-40d8-a8df-80bf01c99e1c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3c16f21f-8bfe-40d8-a8df-80bf01c99e1c" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_3c16f21f-8bfe-40d8-a8df-80bf01c99e1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3c16f21f-8bfe-40d8-a8df-80bf01c99e1c" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PikeRoseHotelJVMember_ab4c1d8a-1a61-4e34-a1ec-6adb13073559" xlink:href="frt-20221231.xsd#frt_PikeRoseHotelJVMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_PikeRoseHotelJVMember_ab4c1d8a-1a61-4e34-a1ec-6adb13073559" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MountVernonMember_f0d43e68-90f0-4255-94cf-303840a31aa0" xlink:href="frt-20221231.xsd#frt_MountVernonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_MountVernonMember_f0d43e68-90f0-4255-94cf-303840a31aa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChesterbrookMember_19620cfc-07da-4dac-aab1-cb9a0a531cc5" xlink:href="frt-20221231.xsd#frt_ChesterbrookMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_ChesterbrookMember_19620cfc-07da-4dac-aab1-cb9a0a531cc5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GrossmontCenterMember_b2f62cce-f3f5-48b5-8dd4-1749c3103b5c" xlink:href="frt-20221231.xsd#frt_GrossmontCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_GrossmontCenterMember_b2f62cce-f3f5-48b5-8dd4-1749c3103b5c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CamelbackColonnadeMember_4240274c-6cee-4401-a5a2-5e6ad781c083" xlink:href="frt-20221231.xsd#frt_CamelbackColonnadeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_CamelbackColonnadeMember_4240274c-6cee-4401-a5a2-5e6ad781c083" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HiltonVillageMember_a61313bd-5856-4149-ade1-22416ad1ce86" xlink:href="frt-20221231.xsd#frt_HiltonVillageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_HiltonVillageMember_a61313bd-5856-4149-ade1-22416ad1ce86" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TwinbrookeShoppingCentreMember_7675d8ba-2753-42ce-b97e-c3ae3b1fd477" xlink:href="frt-20221231.xsd#frt_TwinbrookeShoppingCentreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_TwinbrookeShoppingCentreMember_7675d8ba-2753-42ce-b97e-c3ae3b1fd477" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TwoProperties2021Member_39ed82c4-9c67-453f-bce9-5a754a48d706" xlink:href="frt-20221231.xsd#frt_TwoProperties2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_274d56ab-43fb-4096-84a1-c63bf1ba4019" xlink:to="loc_frt_TwoProperties2021Member_39ed82c4-9c67-453f-bce9-5a754a48d706" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_07f279fb-dec2-49b3-8c98-d26f83730d18" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_725c6a81-64fd-4d93-b310-0de6a7841cf6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_07f279fb-dec2-49b3-8c98-d26f83730d18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_07f279fb-dec2-49b3-8c98-d26f83730d18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_07f279fb-dec2-49b3-8c98-d26f83730d18" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_07f279fb-dec2-49b3-8c98-d26f83730d18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c211535e-2879-45d0-8921-b9996c6490ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_07f279fb-dec2-49b3-8c98-d26f83730d18" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c211535e-2879-45d0-8921-b9996c6490ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_dcc308f5-faf3-4d72-b443-875c10f3288a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_725c6a81-64fd-4d93-b310-0de6a7841cf6" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_dcc308f5-faf3-4d72-b443-875c10f3288a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_dcc308f5-faf3-4d72-b443-875c10f3288a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_dcc308f5-faf3-4d72-b443-875c10f3288a" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_dcc308f5-faf3-4d72-b443-875c10f3288a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_77ff4c99-cbf9-48b6-a577-e4aa22202210" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_dcc308f5-faf3-4d72-b443-875c10f3288a" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_77ff4c99-cbf9-48b6-a577-e4aa22202210" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_08b47fbd-0fb4-41f6-b079-2b367d7746a0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_77ff4c99-cbf9-48b6-a577-e4aa22202210" xlink:to="loc_us-gaap_OtherAssetsMember_08b47fbd-0fb4-41f6-b079-2b367d7746a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_14c94866-c177-4ff8-a09b-179569ee0eaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_77ff4c99-cbf9-48b6-a577-e4aa22202210" xlink:to="loc_us-gaap_OtherLiabilitiesMember_14c94866-c177-4ff8-a09b-179569ee0eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_78f6f1b4-afe0-4b8b-8b7a-7c5138e09cea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_725c6a81-64fd-4d93-b310-0de6a7841cf6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_78f6f1b4-afe0-4b8b-8b7a-7c5138e09cea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_78f6f1b4-afe0-4b8b-8b7a-7c5138e09cea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_78f6f1b4-afe0-4b8b-8b7a-7c5138e09cea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_78f6f1b4-afe0-4b8b-8b7a-7c5138e09cea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1459cdf-d4c6-4529-ad26-79660dec2acc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_78f6f1b4-afe0-4b8b-8b7a-7c5138e09cea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1459cdf-d4c6-4529-ad26-79660dec2acc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAcquiredInPlaceMember_c35cdb87-d6c5-4c31-8d24-92dbd7eef8a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeasesAcquiredInPlaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1459cdf-d4c6-4529-ad26-79660dec2acc" xlink:to="loc_us-gaap_LeasesAcquiredInPlaceMember_c35cdb87-d6c5-4c31-8d24-92dbd7eef8a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AboveMarketLeasesMember_b80175c3-a4f8-49dd-bb70-f03ddc5d7878" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AboveMarketLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1459cdf-d4c6-4529-ad26-79660dec2acc" xlink:to="loc_us-gaap_AboveMarketLeasesMember_b80175c3-a4f8-49dd-bb70-f03ddc5d7878" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/AcquiredInPlaceLeasesAcquredLeaseAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#AcquiredInPlaceLeasesAcquredLeaseAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/AcquiredInPlaceLeasesAcquredLeaseAssetsandLiabilitiesDetails" xlink:type="extended" id="if646b55130ba4715998eeb7d71fff873_AcquiredInPlaceLeasesAcquredLeaseAssetsandLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5c1dca07-f922-4169-a511-24e690db9fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_5c1dca07-f922-4169-a511-24e690db9fcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_702a150f-0167-4a96-aace-a917d082774a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_702a150f-0167-4a96-aace-a917d082774a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FiniteLivedIntangibleLiabilitiesGross_49ed8cde-5c27-40fa-a409-c1c18330b9e4" xlink:href="frt-20221231.xsd#frt_FiniteLivedIntangibleLiabilitiesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_frt_FiniteLivedIntangibleLiabilitiesGross_49ed8cde-5c27-40fa-a409-c1c18330b9e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_688c2141-3c78-4965-b733-1d0d5ce7d63e" xlink:href="frt-20221231.xsd#frt_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_frt_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_688c2141-3c78-4965-b733-1d0d5ce7d63e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_fbccc1eb-da7e-448d-919f-9b811cb3c8d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_fbccc1eb-da7e-448d-919f-9b811cb3c8d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfBelowMarketLease_dbf02413-07ce-4ccd-bc6a-e8c536d0a705" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfBelowMarketLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_AmortizationOfBelowMarketLease_dbf02413-07ce-4ccd-bc6a-e8c536d0a705" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfAboveAndBelowMarketLeases_e2451832-ee3c-42c1-9c71-e83a3149c973" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfAboveAndBelowMarketLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_AmortizationOfAboveAndBelowMarketLeases_e2451832-ee3c-42c1-9c71-e83a3149c973" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AmortizationofBelowMarketLeaseLessee_a513629e-04cf-470f-8118-bbb2ade6bfa6" xlink:href="frt-20221231.xsd#frt_AmortizationofBelowMarketLeaseLessee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_frt_AmortizationofBelowMarketLeaseLessee_a513629e-04cf-470f-8118-bbb2ade6bfa6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AmortizationOfIntangibleLiability_7be65692-98e1-401e-98f3-9ca903a06420" xlink:href="frt-20221231.xsd#frt_AmortizationOfIntangibleLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_frt_AmortizationOfIntangibleLiability_7be65692-98e1-401e-98f3-9ca903a06420" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AmortizationOfAboveAndBelowMarketLeasesLessee_60b903d0-0d7c-491c-a566-091a4e5b3032" xlink:href="frt-20221231.xsd#frt_AmortizationOfAboveAndBelowMarketLeasesLessee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_frt_AmortizationOfAboveAndBelowMarketLeasesLessee_60b903d0-0d7c-491c-a566-091a4e5b3032" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_102d3d96-dff8-4abe-b1af-a0b30ee6ccf2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_102d3d96-dff8-4abe-b1af-a0b30ee6ccf2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageUsefulLife_2cd78e0e-aaff-41a9-92a2-20356c7582df" xlink:href="frt-20221231.xsd#frt_AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_frt_AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageUsefulLife_2cd78e0e-aaff-41a9-92a2-20356c7582df" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_8f9e4128-685f-4606-bf7e-0ac07a5a777c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_8f9e4128-685f-4606-bf7e-0ac07a5a777c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_f88a1e8b-7980-45ae-919a-38b46afbfe5e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_f88a1e8b-7980-45ae-919a-38b46afbfe5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_402183f2-976f-4456-be18-7608ff6c7e12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_402183f2-976f-4456-be18-7608ff6c7e12" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_e3fe43af-27d5-46a8-88af-f95c55807e07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_e3fe43af-27d5-46a8-88af-f95c55807e07" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_ec43c7a3-d9f3-4966-ad74-e3bd066a8788" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_ec43c7a3-d9f3-4966-ad74-e3bd066a8788" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_0f7ba6a8-d14c-44b5-9d19-3fdcd6a99ef8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_0f7ba6a8-d14c-44b5-9d19-3fdcd6a99ef8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_aec9b2b5-e65f-4691-9167-5908f417817a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_2fa880ad-119b-408d-ac03-cc5fc7a7bc34" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_aec9b2b5-e65f-4691-9167-5908f417817a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAmortizationIncomeNextTwelveMonths_2d31cf48-ade0-4a26-8bbe-b3275ed4ae9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAmortizationIncomeNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:to="loc_us-gaap_BelowMarketLeaseAmortizationIncomeNextTwelveMonths_2d31cf48-ade0-4a26-8bbe-b3275ed4ae9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearTwo_b5c89534-3ad4-4b6e-aa03-1a5ee30c600e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAmortizationIncomeYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:to="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearTwo_b5c89534-3ad4-4b6e-aa03-1a5ee30c600e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearThree_145a2edd-8bbd-4e36-b1f8-1b8e1916ed00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAmortizationIncomeYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:to="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearThree_145a2edd-8bbd-4e36-b1f8-1b8e1916ed00" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearFour_4a12d675-4f38-4c84-9c65-679f570fbfb5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAmortizationIncomeYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:to="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearFour_4a12d675-4f38-4c84-9c65-679f570fbfb5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearFive_41b2e2d1-c5a0-4614-ad68-20f898b1880f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAmortizationIncomeYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:to="loc_us-gaap_BelowMarketLeaseAmortizationIncomeYearFive_41b2e2d1-c5a0-4614-ad68-20f898b1880f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseAmortizationIncomeAfterYearFive_9528a23a-f1a4-490a-be67-a61751790f69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseAmortizationIncomeAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:to="loc_us-gaap_BelowMarketLeaseAmortizationIncomeAfterYearFive_9528a23a-f1a4-490a-be67-a61751790f69" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BelowMarketLeaseNet_a67e3b9f-ee2f-4300-8f92-057c63013d73" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BelowMarketLeaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BelowMarketLeaseAmortizationIncomeMaturityScheduleAbstract_73323f6d-0b73-47d8-9e90-67b4a9c1f64d" xlink:to="loc_us-gaap_BelowMarketLeaseNet_a67e3b9f-ee2f-4300-8f92-057c63013d73" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_55d76d77-2086-4678-9ef3-db65cdc0ca65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c9d3df3f-b130-4743-a718-8777f78ff569" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_55d76d77-2086-4678-9ef3-db65cdc0ca65" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassAxis_eb7cc12c-d001-4a98-b7d6-3e70f1ca0bcc" xlink:href="frt-20221231.xsd#frt_FiniteLivedIntangibleLiabilitiesByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_55d76d77-2086-4678-9ef3-db65cdc0ca65" xlink:to="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassAxis_eb7cc12c-d001-4a98-b7d6-3e70f1ca0bcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain_eb7cc12c-d001-4a98-b7d6-3e70f1ca0bcc_default" xlink:href="frt-20221231.xsd#frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassAxis_eb7cc12c-d001-4a98-b7d6-3e70f1ca0bcc" xlink:to="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain_eb7cc12c-d001-4a98-b7d6-3e70f1ca0bcc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain_d103151e-8c25-46ca-8a60-23531cc08e1a" xlink:href="frt-20221231.xsd#frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassAxis_eb7cc12c-d001-4a98-b7d6-3e70f1ca0bcc" xlink:to="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain_d103151e-8c25-46ca-8a60-23531cc08e1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BelowMarketLeasesLessorMember_42d18052-1f8a-4552-bad5-f5f01fa8fe00" xlink:href="frt-20221231.xsd#frt_BelowMarketLeasesLessorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain_d103151e-8c25-46ca-8a60-23531cc08e1a" xlink:to="loc_frt_BelowMarketLeasesLessorMember_42d18052-1f8a-4552-bad5-f5f01fa8fe00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AboveMarketLeasesLesseeMember_d4ef0e8a-e2f0-442d-9eb6-bbb28d3acb96" xlink:href="frt-20221231.xsd#frt_AboveMarketLeasesLesseeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_FiniteLivedIntangibleLiabilitiesByMajorClassDomain_d103151e-8c25-46ca-8a60-23531cc08e1a" xlink:to="loc_frt_AboveMarketLeasesLesseeMember_d4ef0e8a-e2f0-442d-9eb6-bbb28d3acb96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6551de1c-0b88-4ea3-950a-c6d2b2e5f954" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_55d76d77-2086-4678-9ef3-db65cdc0ca65" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6551de1c-0b88-4ea3-950a-c6d2b2e5f954" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6551de1c-0b88-4ea3-950a-c6d2b2e5f954_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6551de1c-0b88-4ea3-950a-c6d2b2e5f954" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6551de1c-0b88-4ea3-950a-c6d2b2e5f954_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7cad149-05fe-4a2b-8952-8147f199c364" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6551de1c-0b88-4ea3-950a-c6d2b2e5f954" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7cad149-05fe-4a2b-8952-8147f199c364" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AboveMarketLeasesMember_09213ed3-45f6-4dbd-a0c6-35114688ae62" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AboveMarketLeasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7cad149-05fe-4a2b-8952-8147f199c364" xlink:to="loc_us-gaap_AboveMarketLeasesMember_09213ed3-45f6-4dbd-a0c6-35114688ae62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AboveMarketLeasesLessorMember_e20c927a-24af-4494-aea1-f88ff3009639" xlink:href="frt-20221231.xsd#frt_AboveMarketLeasesLessorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7cad149-05fe-4a2b-8952-8147f199c364" xlink:to="loc_frt_AboveMarketLeasesLessorMember_e20c927a-24af-4494-aea1-f88ff3009639" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BelowMarketLeasesLesseeMember_9735afde-4003-4445-a879-dd30e989ff19" xlink:href="frt-20221231.xsd#frt_BelowMarketLeasesLesseeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7cad149-05fe-4a2b-8952-8147f199c364" xlink:to="loc_frt_BelowMarketLeasesLesseeMember_9735afde-4003-4445-a879-dd30e989ff19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BelowMarketLeaseMember_d4c15862-616f-4092-a00b-6f498e5f2312" xlink:href="frt-20221231.xsd#frt_BelowMarketLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7cad149-05fe-4a2b-8952-8147f199c364" xlink:to="loc_frt_BelowMarketLeaseMember_d4c15862-616f-4092-a00b-6f498e5f2312" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/DebtSummaryOfDebtOutstandingDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#DebtSummaryOfDebtOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/DebtSummaryOfDebtOutstandingDetails" xlink:type="extended" id="ie4de1e90a1d941c28b48e99aa3cafc8a_DebtSummaryOfDebtOutstandingDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_0a8f70ae-2f54-4d51-a773-80d6e0c9db0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_0a8f70ae-2f54-4d51-a773-80d6e0c9db0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_f32e9fde-0bbe-4f69-a9df-18baf7573554" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_f32e9fde-0bbe-4f69-a9df-18baf7573554" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_36a9ae7c-0fed-46e9-815e-1545b1c97749" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_36a9ae7c-0fed-46e9-815e-1545b1c97749" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_69a34f32-c452-4342-8ed2-8bdd64791903" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_69a34f32-c452-4342-8ed2-8bdd64791903" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_6547f563-8c7d-4764-a9d5-365a9222b238" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_SecuredDebt_6547f563-8c7d-4764-a9d5-365a9222b238" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNotesPayable_24d7068c-ccb4-40c2-8be3-5a4421851842" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_OtherNotesPayable_24d7068c-ccb4-40c2-8be3-5a4421851842" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_0d5ee999-9755-4df3-87ec-78c2f6221556" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_LineOfCredit_0d5ee999-9755-4df3-87ec-78c2f6221556" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NotesPayableGross_cc0679e2-8112-4e8c-aae8-e2b51e749002" xlink:href="frt-20221231.xsd#frt_NotesPayableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_frt_NotesPayableGross_cc0679e2-8112-4e8c-aae8-e2b51e749002" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_8a4785a9-2c17-4a4b-9ee9-469ce2ca106b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_8a4785a9-2c17-4a4b-9ee9-469ce2ca106b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayable_cc9ec95f-d0ad-443d-92b9-9aed41639a78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_NotesPayable_cc9ec95f-d0ad-443d-92b9-9aed41639a78" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_b950e444-dc6a-4709-a4c7-4482ddb83298" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_SeniorNotes_b950e444-dc6a-4709-a4c7-4482ddb83298" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_93ee64d0-0782-46ee-a476-ee128403bfbd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_93ee64d0-0782-46ee-a476-ee128403bfbd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_132a4d95-edf9-4e3f-a071-4c2004fe352e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfInterestRateDerivativesHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_132a4d95-edf9-4e3f-a071-4c2004fe352e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_bba1cf35-e598-40e9-9440-f31814fbf6ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_bba1cf35-e598-40e9-9440-f31814fbf6ce" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SpreadAdjustment_7e958b3f-7c42-410d-a703-3cd11209e63f" xlink:href="frt-20221231.xsd#frt_SpreadAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_frt_SpreadAdjustment_7e958b3f-7c42-410d-a703-3cd11209e63f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_5a9bf7db-e1cb-492c-aa8a-64a71e3f0363" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_5a9bf7db-e1cb-492c-aa8a-64a71e3f0363" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees_f8fa0b1e-f7be-4f91-9cbc-9ea3a20a8596" xlink:href="frt-20221231.xsd#frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees_f8fa0b1e-f7be-4f91-9cbc-9ea3a20a8596" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3d94de68-3467-4c67-9943-424179d6ac2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f78224c5-9847-4877-a052-08a1e109eaab" xlink:to="loc_us-gaap_DebtInstrumentTable_3d94de68-3467-4c67-9943-424179d6ac2f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e0dd21cf-3881-4105-979d-cb617a140403" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3d94de68-3467-4c67-9943-424179d6ac2f" xlink:to="loc_srt_RangeAxis_e0dd21cf-3881-4105-979d-cb617a140403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e0dd21cf-3881-4105-979d-cb617a140403_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e0dd21cf-3881-4105-979d-cb617a140403" xlink:to="loc_srt_RangeMember_e0dd21cf-3881-4105-979d-cb617a140403_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c71fb359-f0d1-4cce-b2e5-b025c1a1740c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e0dd21cf-3881-4105-979d-cb617a140403" xlink:to="loc_srt_RangeMember_c71fb359-f0d1-4cce-b2e5-b025c1a1740c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_75f3f707-3ebc-4923-9a61-17418f45b5f7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c71fb359-f0d1-4cce-b2e5-b025c1a1740c" xlink:to="loc_srt_MinimumMember_75f3f707-3ebc-4923-9a61-17418f45b5f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4091b995-fb20-4593-99b5-0d8b5665e43f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c71fb359-f0d1-4cce-b2e5-b025c1a1740c" xlink:to="loc_srt_MaximumMember_4091b995-fb20-4593-99b5-0d8b5665e43f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_4b7c2140-1489-4041-8120-4aadf433d6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3d94de68-3467-4c67-9943-424179d6ac2f" xlink:to="loc_us-gaap_DebtInstrumentAxis_4b7c2140-1489-4041-8120-4aadf433d6c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_4b7c2140-1489-4041-8120-4aadf433d6c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_4b7c2140-1489-4041-8120-4aadf433d6c7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_4b7c2140-1489-4041-8120-4aadf433d6c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_4b7c2140-1489-4041-8120-4aadf433d6c7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AzaleaMember_66344bc8-0b2d-4bc3-90da-3adc50bfd986" xlink:href="frt-20221231.xsd#frt_AzaleaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_AzaleaMember_66344bc8-0b2d-4bc3-90da-3adc50bfd986" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BellGardensMember_17fdd34c-8903-4f1f-82e5-c2403b4ba271" xlink:href="frt-20221231.xsd#frt_BellGardensMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_BellGardensMember_17fdd34c-8903-4f1f-82e5-c2403b4ba271" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PlazaElSegundoMember_faec11b2-68c0-49ac-95f1-1b16e7ef1fd5" xlink:href="frt-20221231.xsd#frt_PlazaElSegundoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_PlazaElSegundoMember_faec11b2-68c0-49ac-95f1-1b16e7ef1fd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GroveatShrewsburyEastMember_a4d66523-8ad8-4844-8925-b5504985d98d" xlink:href="frt-20221231.xsd#frt_GroveatShrewsburyEastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_GroveatShrewsburyEastMember_a4d66523-8ad8-4844-8925-b5504985d98d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Brook35Member_3d6c477f-d692-460a-afcd-d2a9fab488a3" xlink:href="frt-20221231.xsd#frt_Brook35Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_Brook35Member_3d6c477f-d692-460a-afcd-d2a9fab488a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Hoboken24BuildingsMember_bd1af3b0-0f59-4dad-adef-62a4b1de798c" xlink:href="frt-20221231.xsd#frt_Hoboken24BuildingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_Hoboken24BuildingsMember_bd1af3b0-0f59-4dad-adef-62a4b1de798c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Hoboken14BuildingsMember_1ba107d0-aff5-4896-9196-f25e55e5ad43" xlink:href="frt-20221231.xsd#frt_Hoboken14BuildingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_Hoboken14BuildingsMember_1ba107d0-aff5-4896-9196-f25e55e5ad43" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChelseaMember_46d2d982-0af9-4fd7-9d89-1db54386aca0" xlink:href="frt-20221231.xsd#frt_ChelseaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_ChelseaMember_46d2d982-0af9-4fd7-9d89-1db54386aca0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Hoboken21014thStreetMember_c656a7f1-76c9-4e81-b792-e55019d9cead" xlink:href="frt-20221231.xsd#frt_Hoboken21014thStreetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_Hoboken21014thStreetMember_c656a7f1-76c9-4e81-b792-e55019d9cead" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TermloanMember_d2c977c9-8186-40a3-9adb-60639d7025f7" xlink:href="frt-20221231.xsd#frt_TermloanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_TermloanMember_d2c977c9-8186-40a3-9adb-60639d7025f7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_a73d68a7-df27-459e-aca8-5fa47cf04671" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_a73d68a7-df27-459e-aca8-5fa47cf04671" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_VariousNotesPayableMember_700d8bf2-80a7-4a43-8738-8a94ebd2f7c3" xlink:href="frt-20221231.xsd#frt_VariousNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_VariousNotesPayableMember_700d8bf2-80a7-4a43-8738-8a94ebd2f7c3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Senior2Point75PercentNotesMember_62fc83da-a9d7-4fbe-866c-43e1701f891c" xlink:href="frt-20221231.xsd#frt_Senior2Point75PercentNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_Senior2Point75PercentNotesMember_62fc83da-a9d7-4fbe-866c-43e1701f891c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Senior395percentnotesMember_2b67c2f3-82fb-4a0a-a06e-36a928d5018b" xlink:href="frt-20221231.xsd#frt_Senior395percentnotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_Senior395percentnotesMember_2b67c2f3-82fb-4a0a-a06e-36a928d5018b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A125SeniorNoteMember_88303351-b22d-48e5-8a61-e111fa0e8302" xlink:href="frt-20221231.xsd#frt_A125SeniorNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_A125SeniorNoteMember_88303351-b22d-48e5-8a61-e111fa0e8302" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Debentures748PercentMember_0eab8a28-c4b7-4307-a468-c2a9fdcbe00e" xlink:href="frt-20221231.xsd#frt_Debentures748PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_Debentures748PercentMember_0eab8a28-c4b7-4307-a468-c2a9fdcbe00e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A3.25SeniornotesMember_631ed127-234b-488a-ab68-d2d20599560b" xlink:href="frt-20221231.xsd#frt_A3.25SeniornotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_A3.25SeniornotesMember_631ed127-234b-488a-ab68-d2d20599560b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MediumTermNotes682PercentMember_601172c3-6c5b-44cf-8ae4-32ac0209af7a" xlink:href="frt-20221231.xsd#frt_MediumTermNotes682PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_MediumTermNotes682PercentMember_601172c3-6c5b-44cf-8ae4-32ac0209af7a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A3.2SeniorNoteMember_ed458379-62f6-40fc-8ca0-ab08bbc84ba9" xlink:href="frt-20221231.xsd#frt_A3.2SeniorNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_A3.2SeniorNoteMember_ed458379-62f6-40fc-8ca0-ab08bbc84ba9" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A35SeniorNoteMember_aa29791a-3685-40fa-a73f-427722447cab" xlink:href="frt-20221231.xsd#frt_A35SeniorNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_A35SeniorNoteMember_aa29791a-3685-40fa-a73f-427722447cab" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A4.50SeniornotesMember_9dee0c63-7805-46d2-acd9-4f71df93e43e" xlink:href="frt-20221231.xsd#frt_A4.50SeniornotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_A4.50SeniornotesMember_9dee0c63-7805-46d2-acd9-4f71df93e43e" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A3.625SeniornotesMember_fb713eeb-1b37-4079-8909-76eeea86503c" xlink:href="frt-20221231.xsd#frt_A3.625SeniornotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_cbc5e166-7727-4887-8735-1133a029a954" xlink:to="loc_frt_A3.625SeniornotesMember_fb713eeb-1b37-4079-8909-76eeea86503c" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_3b55c063-ae6f-4233-8b13-3806d5b0d532" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3d94de68-3467-4c67-9943-424179d6ac2f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_3b55c063-ae6f-4233-8b13-3806d5b0d532" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3b55c063-ae6f-4233-8b13-3806d5b0d532_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3b55c063-ae6f-4233-8b13-3806d5b0d532" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3b55c063-ae6f-4233-8b13-3806d5b0d532_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0c410376-dc38-4c20-ad49-e01c30c5836a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_3b55c063-ae6f-4233-8b13-3806d5b0d532" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0c410376-dc38-4c20-ad49-e01c30c5836a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_717f0019-6f5b-4c5e-9096-bf972fff3acb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0c410376-dc38-4c20-ad49-e01c30c5836a" xlink:to="loc_us-gaap_SecuredDebtMember_717f0019-6f5b-4c5e-9096-bf972fff3acb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TermloanMember_56ac643f-d09c-4917-82a1-b5633571f6e7" xlink:href="frt-20221231.xsd#frt_TermloanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0c410376-dc38-4c20-ad49-e01c30c5836a" xlink:to="loc_frt_TermloanMember_56ac643f-d09c-4917-82a1-b5633571f6e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_ac22df85-d704-489f-a9dc-fe74413b6ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0c410376-dc38-4c20-ad49-e01c30c5836a" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_ac22df85-d704-489f-a9dc-fe74413b6ec0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_bf406328-43df-4f2f-99e1-9872128aafb0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0c410376-dc38-4c20-ad49-e01c30c5836a" xlink:to="loc_us-gaap_SeniorNotesMember_bf406328-43df-4f2f-99e1-9872128aafb0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_ea5e3bbe-c32f-4997-b870-8fae68dc8b36" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3d94de68-3467-4c67-9943-424179d6ac2f" xlink:to="loc_us-gaap_VariableRateAxis_ea5e3bbe-c32f-4997-b870-8fae68dc8b36" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_ea5e3bbe-c32f-4997-b870-8fae68dc8b36_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_ea5e3bbe-c32f-4997-b870-8fae68dc8b36" xlink:to="loc_us-gaap_VariableRateDomain_ea5e3bbe-c32f-4997-b870-8fae68dc8b36_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_186899c4-0e79-4229-bbb0-34429a2237f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_ea5e3bbe-c32f-4997-b870-8fae68dc8b36" xlink:to="loc_us-gaap_VariableRateDomain_186899c4-0e79-4229-bbb0-34429a2237f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_cdfc081d-0c71-4573-a8c4-efd2b83917ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_186899c4-0e79-4229-bbb0-34429a2237f8" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_cdfc081d-0c71-4573-a8c4-efd2b83917ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SOFRMember_b86d105c-ebf9-4a4b-bfe6-c34dc6eaf4bb" xlink:href="frt-20221231.xsd#frt_SOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_186899c4-0e79-4229-bbb0-34429a2237f8" xlink:to="loc_frt_SOFRMember_b86d105c-ebf9-4a4b-bfe6-c34dc6eaf4bb" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/DebtNarrativeDetails" xlink:type="extended" id="iff974c47e8a642c9aa2408395cfa5261_DebtNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_880353ad-08c2-47f2-aa81-4dfddd667218" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_880353ad-08c2-47f2-aa81-4dfddd667218" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_56ba18d9-cfca-479e-9a1e-8436d5a1126c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_56ba18d9-cfca-479e-9a1e-8436d5a1126c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SpreadAdjustment_b204c69a-8414-4881-91dc-c6b21ce709da" xlink:href="frt-20221231.xsd#frt_SpreadAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_frt_SpreadAdjustment_b204c69a-8414-4881-91dc-c6b21ce709da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_7d62427d-b22b-4810-829f-6cbbb54778e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_7d62427d-b22b-4810-829f-6cbbb54778e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MaximumBorrowingCapacityAfterOptionToIncreaseCreditFacility_502683a5-2372-4006-8f10-56e78c574236" xlink:href="frt-20221231.xsd#frt_MaximumBorrowingCapacityAfterOptionToIncreaseCreditFacility"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_frt_MaximumBorrowingCapacityAfterOptionToIncreaseCreditFacility_502683a5-2372-4006-8f10-56e78c574236" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_040bcc78-d824-4a4c-8cc5-c627eb5a2947" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_040bcc78-d824-4a4c-8cc5-c627eb5a2947" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_6775ea9d-4103-48ad-aa8e-d116410298e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAverageOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_6775ea9d-4103-48ad-aa8e-d116410298e3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees_55134b84-da45-4584-8b7c-128d868fd29c" xlink:href="frt-20221231.xsd#frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees_55134b84-da45-4584-8b7c-128d868fd29c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Lineofcreditfacilityannualfacilityfee_799cd2fa-dbaf-491c-b4fc-e0b129a8c950" xlink:href="frt-20221231.xsd#frt_Lineofcreditfacilityannualfacilityfee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_frt_Lineofcreditfacilityannualfacilityfee_799cd2fa-dbaf-491c-b4fc-e0b129a8c950" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_5c1aae98-178f-4c0c-9c40-88f824fd5989" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_LineOfCredit_5c1aae98-178f-4c0c-9c40-88f824fd5989" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_4debe733-ac72-469b-9439-a29a931f1a4d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_4debe733-ac72-469b-9439-a29a931f1a4d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNotesPayable_a6381fc2-1e44-4ca0-a03b-ab88c3a7b37e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_OtherNotesPayable_a6381fc2-1e44-4ca0-a03b-ab88c3a7b37e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_3d520bbc-a43f-450e-9731-a4dbfe8ff531" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_3d520bbc-a43f-450e-9731-a4dbfe8ff531" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_85a7b320-89be-4d30-a3cc-740d7383e0af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_85a7b320-89be-4d30-a3cc-740d7383e0af" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_e728cea7-70aa-4e59-b545-83d8292550bf" xlink:to="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_72a6c82e-55ba-4737-850a-51b08540f5d9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_72a6c82e-55ba-4737-850a-51b08540f5d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_72a6c82e-55ba-4737-850a-51b08540f5d9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_72a6c82e-55ba-4737-850a-51b08540f5d9" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_72a6c82e-55ba-4737-850a-51b08540f5d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_d9f39315-965e-4c3d-816e-16d7ceda11dc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_72a6c82e-55ba-4737-850a-51b08540f5d9" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_d9f39315-965e-4c3d-816e-16d7ceda11dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Hoboken21014thStreetMember_37df98e7-814e-4b3f-9f30-8500da9b1b55" xlink:href="frt-20221231.xsd#frt_Hoboken21014thStreetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_d9f39315-965e-4c3d-816e-16d7ceda11dc" xlink:to="loc_frt_Hoboken21014thStreetMember_37df98e7-814e-4b3f-9f30-8500da9b1b55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_25ead9db-5e42-4755-8695-964eecc5ce16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_us-gaap_DebtInstrumentAxis_25ead9db-5e42-4755-8695-964eecc5ce16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_25ead9db-5e42-4755-8695-964eecc5ce16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_25ead9db-5e42-4755-8695-964eecc5ce16" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_25ead9db-5e42-4755-8695-964eecc5ce16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_176e98bc-d240-44df-9b4f-a67db27e7fc6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_25ead9db-5e42-4755-8695-964eecc5ce16" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_176e98bc-d240-44df-9b4f-a67db27e7fc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_861d515f-e1a1-4a96-a333-6396b9ee38eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_176e98bc-d240-44df-9b4f-a67db27e7fc6" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_861d515f-e1a1-4a96-a333-6396b9ee38eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TermloanMember_b1b9f223-052f-48be-bc63-aa565faf77ed" xlink:href="frt-20221231.xsd#frt_TermloanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_176e98bc-d240-44df-9b4f-a67db27e7fc6" xlink:to="loc_frt_TermloanMember_b1b9f223-052f-48be-bc63-aa565faf77ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Hoboken14BuildingsMember_4d11a745-8b8c-4637-a739-3cce284a8352" xlink:href="frt-20221231.xsd#frt_Hoboken14BuildingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_176e98bc-d240-44df-9b4f-a67db27e7fc6" xlink:to="loc_frt_Hoboken14BuildingsMember_4d11a745-8b8c-4637-a739-3cce284a8352" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_VariousNotesPayableMember_d7028249-13d5-4d55-8c3f-d66be792cf72" xlink:href="frt-20221231.xsd#frt_VariousNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_176e98bc-d240-44df-9b4f-a67db27e7fc6" xlink:to="loc_frt_VariousNotesPayableMember_d7028249-13d5-4d55-8c3f-d66be792cf72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OptionByTypeAxis_961e9cbc-9302-40e3-8dac-69d647966cbb" xlink:href="frt-20221231.xsd#frt_OptionByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_frt_OptionByTypeAxis_961e9cbc-9302-40e3-8dac-69d647966cbb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OptionByTypeDomain_961e9cbc-9302-40e3-8dac-69d647966cbb_default" xlink:href="frt-20221231.xsd#frt_OptionByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_OptionByTypeAxis_961e9cbc-9302-40e3-8dac-69d647966cbb" xlink:to="loc_frt_OptionByTypeDomain_961e9cbc-9302-40e3-8dac-69d647966cbb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OptionByTypeDomain_fac10e9c-c55f-4d85-9ba3-6289d3c67f84" xlink:href="frt-20221231.xsd#frt_OptionByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_OptionByTypeAxis_961e9cbc-9302-40e3-8dac-69d647966cbb" xlink:to="loc_frt_OptionByTypeDomain_fac10e9c-c55f-4d85-9ba3-6289d3c67f84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2a9b71d2-0d81-4832-a148-52bdffcc02e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2a9b71d2-0d81-4832-a148-52bdffcc02e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_2a9b71d2-0d81-4832-a148-52bdffcc02e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2a9b71d2-0d81-4832-a148-52bdffcc02e6" xlink:to="loc_us-gaap_RelatedPartyDomain_2a9b71d2-0d81-4832-a148-52bdffcc02e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_9b690afc-8674-46d9-b59e-2d2a957350eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2a9b71d2-0d81-4832-a148-52bdffcc02e6" xlink:to="loc_us-gaap_RelatedPartyDomain_9b690afc-8674-46d9-b59e-2d2a957350eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cdbafe26-021e-49a1-8669-13824ca50ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cdbafe26-021e-49a1-8669-13824ca50ca6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cdbafe26-021e-49a1-8669-13824ca50ca6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cdbafe26-021e-49a1-8669-13824ca50ca6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cdbafe26-021e-49a1-8669-13824ca50ca6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_92636a3b-db26-440f-8839-2433b0561fb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cdbafe26-021e-49a1-8669-13824ca50ca6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_92636a3b-db26-440f-8839-2433b0561fb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TermloanMember_07d2437c-75ee-4695-a0a6-a7ffc3e97cfa" xlink:href="frt-20221231.xsd#frt_TermloanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_92636a3b-db26-440f-8839-2433b0561fb1" xlink:to="loc_frt_TermloanMember_07d2437c-75ee-4695-a0a6-a7ffc3e97cfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_485f8d7b-fe35-430a-b6da-2a141527f3e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_92636a3b-db26-440f-8839-2433b0561fb1" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_485f8d7b-fe35-430a-b6da-2a141527f3e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_1bb37eb2-e5b1-48d6-9a39-4ff5a96a65fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_92636a3b-db26-440f-8839-2433b0561fb1" xlink:to="loc_us-gaap_SecuredDebtMember_1bb37eb2-e5b1-48d6-9a39-4ff5a96a65fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecourseStatusAxis_3ae47797-2b05-45ec-91b3-09d8e43656da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RecourseStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_us-gaap_RecourseStatusAxis_3ae47797-2b05-45ec-91b3-09d8e43656da" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecourseStatusDomain_3ae47797-2b05-45ec-91b3-09d8e43656da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RecourseStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RecourseStatusAxis_3ae47797-2b05-45ec-91b3-09d8e43656da" xlink:to="loc_us-gaap_RecourseStatusDomain_3ae47797-2b05-45ec-91b3-09d8e43656da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecourseStatusDomain_7dc00d89-e3ed-4b8c-909b-7f0c787122b0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RecourseStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RecourseStatusAxis_3ae47797-2b05-45ec-91b3-09d8e43656da" xlink:to="loc_us-gaap_RecourseStatusDomain_7dc00d89-e3ed-4b8c-909b-7f0c787122b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_251a7b41-b893-482f-af11-7fb3cfd67bfd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_us-gaap_VariableRateAxis_251a7b41-b893-482f-af11-7fb3cfd67bfd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_251a7b41-b893-482f-af11-7fb3cfd67bfd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_251a7b41-b893-482f-af11-7fb3cfd67bfd" xlink:to="loc_us-gaap_VariableRateDomain_251a7b41-b893-482f-af11-7fb3cfd67bfd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_8785e641-b986-4c26-bc0f-75d82a7387aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_251a7b41-b893-482f-af11-7fb3cfd67bfd" xlink:to="loc_us-gaap_VariableRateDomain_8785e641-b986-4c26-bc0f-75d82a7387aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SOFRMember_a9f45a92-108c-43ce-814f-a69f05b3ce79" xlink:href="frt-20221231.xsd#frt_SOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_8785e641-b986-4c26-bc0f-75d82a7387aa" xlink:to="loc_frt_SOFRMember_a9f45a92-108c-43ce-814f-a69f05b3ce79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5cf0f893-03b1-4856-b3a2-053959c05419" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f005aee1-569c-4945-a42f-3424438ccb05" xlink:to="loc_srt_RangeAxis_5cf0f893-03b1-4856-b3a2-053959c05419" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5cf0f893-03b1-4856-b3a2-053959c05419_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_5cf0f893-03b1-4856-b3a2-053959c05419" xlink:to="loc_srt_RangeMember_5cf0f893-03b1-4856-b3a2-053959c05419_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3061d458-94e7-4895-abf7-58fdef313b19" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_5cf0f893-03b1-4856-b3a2-053959c05419" xlink:to="loc_srt_RangeMember_3061d458-94e7-4895-abf7-58fdef313b19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3bb625c6-3947-4a41-a671-7a033a73ee8d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3061d458-94e7-4895-abf7-58fdef313b19" xlink:to="loc_srt_MinimumMember_3bb625c6-3947-4a41-a671-7a033a73ee8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_06a1d34a-8e7e-4868-8be8-d8e70230a762" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3061d458-94e7-4895-abf7-58fdef313b19" xlink:to="loc_srt_MaximumMember_06a1d34a-8e7e-4868-8be8-d8e70230a762" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/DebtPrincipalPaymentsOnMortgagePayableNotesPayableSeniorNotesandDebenturesDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#DebtPrincipalPaymentsOnMortgagePayableNotesPayableSeniorNotesandDebenturesDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/DebtPrincipalPaymentsOnMortgagePayableNotesPayableSeniorNotesandDebenturesDetails" xlink:type="extended" id="i5ecffade88594fd0869b47a4f64e63bd_DebtPrincipalPaymentsOnMortgagePayableNotesPayableSeniorNotesandDebenturesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_be7366c6-9853-4960-8d65-99b738600a39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_be7366c6-9853-4960-8d65-99b738600a39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_b212540f-6bf2-4eb7-b765-0960e715f0de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_b212540f-6bf2-4eb7-b765-0960e715f0de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_63c5fb89-4b88-4bf5-9378-c224efd074cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_63c5fb89-4b88-4bf5-9378-c224efd074cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_71a2d617-8176-4da3-ac4f-f4332e431c7f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_71a2d617-8176-4da3-ac4f-f4332e431c7f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_5023c12c-7588-4d2c-9a6a-8d02c83cc888" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_5023c12c-7588-4d2c-9a6a-8d02c83cc888" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_6fc389ac-710b-4f6c-8f40-bb85f57abe67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_6fc389ac-710b-4f6c-8f40-bb85f57abe67" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_3441955b-eba8-498c-8264-940d343676c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LongTermDebt_3441955b-eba8-498c-8264-940d343676c9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNotesPayable_36559b92-ada4-4d90-bc19-598106ade2f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_OtherNotesPayable_36559b92-ada4-4d90-bc19-598106ade2f8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_caa1cd2f-3883-4930-bedc-352e8aa30b46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_caa1cd2f-3883-4930-bedc-352e8aa30b46" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_27027271-1f5a-4f8f-bb29-373f53d163c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_LineOfCredit_27027271-1f5a-4f8f-bb29-373f53d163c2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_52eda98b-8931-40fa-9e31-90037931de51" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87a63c06-590a-4e27-af04-208155215715" xlink:to="loc_us-gaap_DebtInstrumentTable_52eda98b-8931-40fa-9e31-90037931de51" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6095648b-dbb9-4bde-88ab-0d286bdc689e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_52eda98b-8931-40fa-9e31-90037931de51" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_6095648b-dbb9-4bde-88ab-0d286bdc689e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6095648b-dbb9-4bde-88ab-0d286bdc689e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6095648b-dbb9-4bde-88ab-0d286bdc689e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6095648b-dbb9-4bde-88ab-0d286bdc689e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0a5167eb-8a42-4fde-a039-d74376e6663d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6095648b-dbb9-4bde-88ab-0d286bdc689e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0a5167eb-8a42-4fde-a039-d74376e6663d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_9de5a02a-ddea-49c4-bd94-3321afe817b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a5167eb-8a42-4fde-a039-d74376e6663d" xlink:to="loc_us-gaap_SecuredDebtMember_9de5a02a-ddea-49c4-bd94-3321afe817b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_2ce96b99-427e-4847-8741-8e8733ad20d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a5167eb-8a42-4fde-a039-d74376e6663d" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_2ce96b99-427e-4847-8741-8e8733ad20d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_fce48fa8-9e47-4648-8672-ba7a3f1ce58f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_0a5167eb-8a42-4fde-a039-d74376e6663d" xlink:to="loc_us-gaap_SeniorNotesMember_fce48fa8-9e47-4648-8672-ba7a3f1ce58f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsSummaryOfCarryingAmountAndFairValueOfFinancialInstrumentsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#FairValueOfFinancialInstrumentsSummaryOfCarryingAmountAndFairValueOfFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsSummaryOfCarryingAmountAndFairValueOfFinancialInstrumentsDetails" xlink:type="extended" id="i01c5d1fe4122439e9093053edfbb7922_FairValueOfFinancialInstrumentsSummaryOfCarryingAmountAndFairValueOfFinancialInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2a0c7279-b9a4-418f-bd59-11d0ff0c6eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_96175756-88e5-415e-a30d-6087d73f2ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2a0c7279-b9a4-418f-bd59-11d0ff0c6eb8" xlink:to="loc_us-gaap_LongTermDebtFairValue_96175756-88e5-415e-a30d-6087d73f2ee7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_55c570de-b4e0-4258-96a2-dfda6ae6830b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2a0c7279-b9a4-418f-bd59-11d0ff0c6eb8" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_55c570de-b4e0-4258-96a2-dfda6ae6830b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4a16ac5e-9e48-4f59-b92f-0c561642c210" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_55c570de-b4e0-4258-96a2-dfda6ae6830b" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4a16ac5e-9e48-4f59-b92f-0c561642c210" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4a16ac5e-9e48-4f59-b92f-0c561642c210_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4a16ac5e-9e48-4f59-b92f-0c561642c210" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4a16ac5e-9e48-4f59-b92f-0c561642c210_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_75a5e043-5839-4ff4-a644-3ebb8ceb0aef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4a16ac5e-9e48-4f59-b92f-0c561642c210" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_75a5e043-5839-4ff4-a644-3ebb8ceb0aef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MortgagesPayableAndNotesPayableMember_487341d9-1ac3-45de-8dfd-e0c9e09c0594" xlink:href="frt-20221231.xsd#frt_MortgagesPayableAndNotesPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_75a5e043-5839-4ff4-a644-3ebb8ceb0aef" xlink:to="loc_frt_MortgagesPayableAndNotesPayableMember_487341d9-1ac3-45de-8dfd-e0c9e09c0594" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SeniorNotesAndDebenturesMember_7fc36dcc-e93f-493e-a850-8bde609ed3f0" xlink:href="frt-20221231.xsd#frt_SeniorNotesAndDebenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_75a5e043-5839-4ff4-a644-3ebb8ceb0aef" xlink:to="loc_frt_SeniorNotesAndDebenturesMember_7fc36dcc-e93f-493e-a850-8bde609ed3f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_22373de2-c965-4849-8c64-62f336458c47" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_55c570de-b4e0-4258-96a2-dfda6ae6830b" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_22373de2-c965-4849-8c64-62f336458c47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_22373de2-c965-4849-8c64-62f336458c47_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_22373de2-c965-4849-8c64-62f336458c47" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_22373de2-c965-4849-8c64-62f336458c47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_4145e3d9-ce4e-449f-a58c-fbe827cd034f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_22373de2-c965-4849-8c64-62f336458c47" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_4145e3d9-ce4e-449f-a58c-fbe827cd034f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_50d277bd-7611-4eca-8c2c-134bb810c255" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_4145e3d9-ce4e-449f-a58c-fbe827cd034f" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_50d277bd-7611-4eca-8c2c-134bb810c255" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_99cf2136-0fc3-4534-9ca6-166699181e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_50d277bd-7611-4eca-8c2c-134bb810c255" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_99cf2136-0fc3-4534-9ca6-166699181e2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_830e3360-94ce-45a4-95cb-16375ca68520" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_50d277bd-7611-4eca-8c2c-134bb810c255" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_830e3360-94ce-45a4-95cb-16375ca68520" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#FairValueOfFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsDetails" xlink:type="extended" id="if31d4d59aa554f6fb991f9216ca731eb_FairValueOfFinancialInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_a277be18-e1ca-4b57-a848-e14e3eac1323" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfInterestRateDerivativesHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_a277be18-e1ca-4b57-a848-e14e3eac1323" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNotionalAmount_f73f9a8c-95a7-4ac5-aa58-acce7b6bbf3f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_DerivativeLiabilityNotionalAmount_f73f9a8c-95a7-4ac5-aa58-acce7b6bbf3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_fdf0348e-ab0b-42e1-ae04-b9f9036ba18e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_fdf0348e-ab0b-42e1-ae04-b9f9036ba18e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_024611c3-48d8-4c83-9bcd-efaa0591d85c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_024611c3-48d8-4c83-9bcd-efaa0591d85c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDerivativeAssets_7bb9da50-2c51-4743-944a-19afd5c79fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInDerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_IncreaseDecreaseInDerivativeAssets_7bb9da50-2c51-4743-944a-19afd5c79fb2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_12bb0fd6-87aa-43a3-89fe-88d17f676438" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_12bb0fd6-87aa-43a3-89fe-88d17f676438" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_bb53244f-d206-4c25-97f8-069101fca530" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_bb53244f-d206-4c25-97f8-069101fca530" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_544a4442-b990-4ce4-a8c3-a694e7075d06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_DerivativeAssets_544a4442-b990-4ce4-a8c3-a694e7075d06" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_58c71cb8-880a-4d01-89c2-61cd2b81e8ea" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_fdbef8c6-c106-419c-98df-4ed762b4787b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:to="loc_us-gaap_DebtInstrumentAxis_fdbef8c6-c106-419c-98df-4ed762b4787b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fdbef8c6-c106-419c-98df-4ed762b4787b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_fdbef8c6-c106-419c-98df-4ed762b4787b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fdbef8c6-c106-419c-98df-4ed762b4787b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6c3bf136-c067-4828-998b-47d7649e04cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_fdbef8c6-c106-419c-98df-4ed762b4787b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6c3bf136-c067-4828-998b-47d7649e04cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HobokenMember_298298b4-cd6b-4781-86fc-302109a3573a" xlink:href="frt-20221231.xsd#frt_HobokenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6c3bf136-c067-4828-998b-47d7649e04cb" xlink:to="loc_frt_HobokenMember_298298b4-cd6b-4781-86fc-302109a3573a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_6c119d9c-c00c-44ea-a18f-4341fe0f07b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6c3bf136-c067-4828-998b-47d7649e04cb" xlink:to="loc_us-gaap_InterestRateSwapMember_6c119d9c-c00c-44ea-a18f-4341fe0f07b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_72a99f6d-bae0-4312-aed3-0dc5f1208e78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_72a99f6d-bae0-4312-aed3-0dc5f1208e78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_72a99f6d-bae0-4312-aed3-0dc5f1208e78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_72a99f6d-bae0-4312-aed3-0dc5f1208e78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_72a99f6d-bae0-4312-aed3-0dc5f1208e78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_101ed592-d2f4-496f-8dc9-81e60a316ee0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_72a99f6d-bae0-4312-aed3-0dc5f1208e78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_101ed592-d2f4-496f-8dc9-81e60a316ee0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_8248b014-8f6e-4deb-a08a-07435d022014" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_101ed592-d2f4-496f-8dc9-81e60a316ee0" xlink:to="loc_us-gaap_SecuredDebtMember_8248b014-8f6e-4deb-a08a-07435d022014" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_23bc3106-aa67-441f-bddf-3215723ffcf4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_23bc3106-aa67-441f-bddf-3215723ffcf4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_23bc3106-aa67-441f-bddf-3215723ffcf4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_23bc3106-aa67-441f-bddf-3215723ffcf4" xlink:to="loc_us-gaap_EquityComponentDomain_23bc3106-aa67-441f-bddf-3215723ffcf4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8b7b3bc8-ac57-4baf-b98d-325757e51ee1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_23bc3106-aa67-441f-bddf-3215723ffcf4" xlink:to="loc_us-gaap_EquityComponentDomain_8b7b3bc8-ac57-4baf-b98d-325757e51ee1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_51f0d682-9010-45fa-956f-a072b04277d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8b7b3bc8-ac57-4baf-b98d-325757e51ee1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_51f0d682-9010-45fa-956f-a072b04277d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_09d0246a-7a36-4c6f-8e0e-63504d3f8a04" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_09d0246a-7a36-4c6f-8e0e-63504d3f8a04" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_09d0246a-7a36-4c6f-8e0e-63504d3f8a04_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_09d0246a-7a36-4c6f-8e0e-63504d3f8a04" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_09d0246a-7a36-4c6f-8e0e-63504d3f8a04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_6b9c30bb-06ce-49d6-a2d5-75d8841875ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_09d0246a-7a36-4c6f-8e0e-63504d3f8a04" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_6b9c30bb-06ce-49d6-a2d5-75d8841875ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_7f3bb368-2d20-4544-aea3-c354316f30cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_6b9c30bb-06ce-49d6-a2d5-75d8841875ad" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_7f3bb368-2d20-4544-aea3-c354316f30cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_35e96911-418b-40ab-8d96-d45eab87f8f2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_35e96911-418b-40ab-8d96-d45eab87f8f2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_35e96911-418b-40ab-8d96-d45eab87f8f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_35e96911-418b-40ab-8d96-d45eab87f8f2" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_35e96911-418b-40ab-8d96-d45eab87f8f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b27ee9ef-7189-49cd-9667-6515cf786a86" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_35e96911-418b-40ab-8d96-d45eab87f8f2" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b27ee9ef-7189-49cd-9667-6515cf786a86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_2f925012-d7e9-42e6-9782-4e28f5a5ee78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_b27ee9ef-7189-49cd-9667-6515cf786a86" xlink:to="loc_us-gaap_InterestRateSwapMember_2f925012-d7e9-42e6-9782-4e28f5a5ee78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2b9bca75-b863-4882-a587-5d36cf9e253c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_ff3f8b6d-d3b7-4efd-b5de-a4aeb7610bb1" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2b9bca75-b863-4882-a587-5d36cf9e253c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_2b9bca75-b863-4882-a587-5d36cf9e253c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2b9bca75-b863-4882-a587-5d36cf9e253c" xlink:to="loc_us-gaap_RelatedPartyDomain_2b9bca75-b863-4882-a587-5d36cf9e253c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_57065953-601e-4101-bc65-c46574b49200" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2b9bca75-b863-4882-a587-5d36cf9e253c" xlink:to="loc_us-gaap_RelatedPartyDomain_57065953-601e-4101-bc65-c46574b49200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_84a6f21a-cf93-494e-8a1f-c27039a0db03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_57065953-601e-4101-bc65-c46574b49200" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_84a6f21a-cf93-494e-8a1f-c27039a0db03" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsSummaryofFinancialLiabilitiesMeasuredAtFairValueOnARecurringBasisDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#FairValueOfFinancialInstrumentsSummaryofFinancialLiabilitiesMeasuredAtFairValueOnARecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsSummaryofFinancialLiabilitiesMeasuredAtFairValueOnARecurringBasisDetails" xlink:type="extended" id="ib8cfa41dbe004309904aa23c11b9ab8e_FairValueOfFinancialInstrumentsSummaryofFinancialLiabilitiesMeasuredAtFairValueOnARecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_210e8048-aa49-4087-82a5-b6dc7e26f2f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_a84b2487-2688-4db3-bb7a-ce066a9f284d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_210e8048-aa49-4087-82a5-b6dc7e26f2f0" xlink:to="loc_us-gaap_DerivativeAssets_a84b2487-2688-4db3-bb7a-ce066a9f284d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_14891e1d-3d99-4835-a3fa-aa1a5508baf4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_210e8048-aa49-4087-82a5-b6dc7e26f2f0" xlink:to="loc_us-gaap_DerivativeLiabilities_14891e1d-3d99-4835-a3fa-aa1a5508baf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ac2ad7fd-dbfe-4dc7-a977-0349161bd221" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_210e8048-aa49-4087-82a5-b6dc7e26f2f0" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ac2ad7fd-dbfe-4dc7-a977-0349161bd221" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_8ce78c94-69bd-40cb-b9ba-01dee868c716" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ac2ad7fd-dbfe-4dc7-a977-0349161bd221" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_8ce78c94-69bd-40cb-b9ba-01dee868c716" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8ce78c94-69bd-40cb-b9ba-01dee868c716_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8ce78c94-69bd-40cb-b9ba-01dee868c716" xlink:to="loc_us-gaap_EquityComponentDomain_8ce78c94-69bd-40cb-b9ba-01dee868c716_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_09f466de-2964-4c92-8b3c-13b01e9d539a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8ce78c94-69bd-40cb-b9ba-01dee868c716" xlink:to="loc_us-gaap_EquityComponentDomain_09f466de-2964-4c92-8b3c-13b01e9d539a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_32f9f6e3-c47b-42dc-bd15-66ba72bbdddd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_09f466de-2964-4c92-8b3c-13b01e9d539a" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_32f9f6e3-c47b-42dc-bd15-66ba72bbdddd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_1498c46a-163c-43ff-8eb0-7377c0db138b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ac2ad7fd-dbfe-4dc7-a977-0349161bd221" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_1498c46a-163c-43ff-8eb0-7377c0db138b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1498c46a-163c-43ff-8eb0-7377c0db138b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1498c46a-163c-43ff-8eb0-7377c0db138b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1498c46a-163c-43ff-8eb0-7377c0db138b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6fef4faa-9e8f-4ca8-9129-971b935aa29c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1498c46a-163c-43ff-8eb0-7377c0db138b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6fef4faa-9e8f-4ca8-9129-971b935aa29c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_30669c95-2917-4768-a450-2390a008d5fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6fef4faa-9e8f-4ca8-9129-971b935aa29c" xlink:to="loc_us-gaap_InterestRateSwapMember_30669c95-2917-4768-a450-2390a008d5fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3fdbedea-6f06-49dc-be13-33cb769116dd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ac2ad7fd-dbfe-4dc7-a977-0349161bd221" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3fdbedea-6f06-49dc-be13-33cb769116dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_3fdbedea-6f06-49dc-be13-33cb769116dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3fdbedea-6f06-49dc-be13-33cb769116dd" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_3fdbedea-6f06-49dc-be13-33cb769116dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_0a78c6b5-f77c-44b0-9c00-fbd7381f0fce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3fdbedea-6f06-49dc-be13-33cb769116dd" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_0a78c6b5-f77c-44b0-9c00-fbd7381f0fce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_f8cfd724-a1c9-4f6f-8357-e8301e004e67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_0a78c6b5-f77c-44b0-9c00-fbd7381f0fce" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_f8cfd724-a1c9-4f6f-8357-e8301e004e67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b51268dc-4faf-43ae-bd03-abb65ac4b495" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ac2ad7fd-dbfe-4dc7-a977-0349161bd221" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b51268dc-4faf-43ae-bd03-abb65ac4b495" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b51268dc-4faf-43ae-bd03-abb65ac4b495_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b51268dc-4faf-43ae-bd03-abb65ac4b495" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b51268dc-4faf-43ae-bd03-abb65ac4b495_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_dbe0d467-93e5-4942-918f-fe67a7438a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b51268dc-4faf-43ae-bd03-abb65ac4b495" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_dbe0d467-93e5-4942-918f-fe67a7438a4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_a0a36f48-3c41-427a-a5e0-c08ed477caf7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_dbe0d467-93e5-4942-918f-fe67a7438a4e" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_a0a36f48-3c41-427a-a5e0-c08ed477caf7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_6452a947-38fe-436c-b6da-abfe659faf33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_dbe0d467-93e5-4942-918f-fe67a7438a4e" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_6452a947-38fe-436c-b6da-abfe659faf33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_48787de7-972b-4db4-af11-8c3ab3e366e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_dbe0d467-93e5-4942-918f-fe67a7438a4e" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_48787de7-972b-4db4-af11-8c3ab3e366e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b4426107-2dfd-4943-94bb-c48b7224d5aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ac2ad7fd-dbfe-4dc7-a977-0349161bd221" xlink:to="loc_us-gaap_DebtInstrumentAxis_b4426107-2dfd-4943-94bb-c48b7224d5aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b4426107-2dfd-4943-94bb-c48b7224d5aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b4426107-2dfd-4943-94bb-c48b7224d5aa" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b4426107-2dfd-4943-94bb-c48b7224d5aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_213d3a1c-ff61-46c2-b23e-b7249f84f4a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b4426107-2dfd-4943-94bb-c48b7224d5aa" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_213d3a1c-ff61-46c2-b23e-b7249f84f4a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_1f1895a4-5e4a-424e-9144-0f4b6bf2322e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_213d3a1c-ff61-46c2-b23e-b7249f84f4a1" xlink:to="loc_us-gaap_InterestRateSwapMember_1f1895a4-5e4a-424e-9144-0f4b6bf2322e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/CommitmentsandContingenciesDetails" xlink:type="extended" id="ib257a55d75ca4a94a3d3bf0e528a04e0_CommitmentsandContingenciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyAccrual_2a1f3fc9-913a-433f-b42e-181e69a1fb45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductWarrantyAccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_ProductWarrantyAccrual_2a1f3fc9-913a-433f-b42e-181e69a1fb45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyAccrualPayments_f17abd8a-f777-4f07-81a2-865f27ce2d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductWarrantyAccrualPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_ProductWarrantyAccrualPayments_f17abd8a-f777-4f07-81a2-865f27ce2d7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_e5d9fdd5-4886-4158-93c9-025790bd81af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_e5d9fdd5-4886-4158-93c9-025790bd81af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_a0024d3c-c3e4-43ca-adfc-90b99e132c7e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest_a0024d3c-c3e4-43ca-adfc-90b99e132c7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OwnershipInterestSubsequentToRedemption_fd256d5a-c762-44d0-b826-553041706390" xlink:href="frt-20221231.xsd#frt_OwnershipInterestSubsequentToRedemption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_frt_OwnershipInterestSubsequentToRedemption_fd256d5a-c762-44d0-b826-553041706390" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnCondemnation_53d5cf25-132e-4bcc-bfe8-74c307657bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnCondemnation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_GainLossOnCondemnation_53d5cf25-132e-4bcc-bfe8-74c307657bfc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CostsAssociatedWithLeaseBuyoutForAPropertySold_0a770185-8650-4551-8ad4-b2480e1416f5" xlink:href="frt-20221231.xsd#frt_CostsAssociatedWithLeaseBuyoutForAPropertySold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_frt_CostsAssociatedWithLeaseBuyoutForAPropertySold_0a770185-8650-4551-8ad4-b2480e1416f5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationReserve_20464ed4-436f-40fe-92db-690008740f68" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_LitigationReserve_20464ed4-436f-40fe-92db-690008740f68" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_5df030fa-5fd2-4fb2-b271-4d484d590c96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_5df030fa-5fd2-4fb2-b271-4d484d590c96" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligation_488d9207-95a0-494f-aaac-b7f5948e968b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_ContractualObligation_488d9207-95a0-494f-aaac-b7f5948e968b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PurchasePriceUnderOption_d614f1c0-9907-49a3-b2bb-1ccac230d8af" xlink:href="frt-20221231.xsd#frt_PurchasePriceUnderOption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_frt_PurchasePriceUnderOption_d614f1c0-9907-49a3-b2bb-1ccac230d8af" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OwnershipInterestOfOtherPartnerInPutOption_d6445476-6e9e-48b9-9c05-334694c129a1" xlink:href="frt-20221231.xsd#frt_OwnershipInterestOfOtherPartnerInPutOption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_frt_OwnershipInterestOfOtherPartnerInPutOption_d6445476-6e9e-48b9-9c05-334694c129a1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EstimatedLiabilityUponExerciseOfOption_55f6d945-0255-4a99-a12a-8eb7e6b7f735" xlink:href="frt-20221231.xsd#frt_EstimatedLiabilityUponExerciseOfOption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_frt_EstimatedLiabilityUponExerciseOfOption_55f6d945-0255-4a99-a12a-8eb7e6b7f735" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountUnits_2e35ee68-41e4-4f9f-a578-a9d5f6a98478" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_PartnersCapitalAccountUnits_2e35ee68-41e4-4f9f-a578-a9d5f6a98478" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OperatingPartnershipUnitsFairValue_cc17b3cc-9a5c-4955-962f-ae945316a0f2" xlink:href="frt-20221231.xsd#frt_OperatingPartnershipUnitsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_frt_OperatingPartnershipUnitsFairValue_cc17b3cc-9a5c-4955-962f-ae945316a0f2" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_ce3bcd84-9f22-4d14-9337-6453c7b6c42c" xlink:to="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ContractualObligationAxis_28311d5e-0167-4cf9-8cfd-149505846318" xlink:href="frt-20221231.xsd#frt_ContractualObligationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_frt_ContractualObligationAxis_28311d5e-0167-4cf9-8cfd-149505846318" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ContractualObligationDomain_28311d5e-0167-4cf9-8cfd-149505846318_default" xlink:href="frt-20221231.xsd#frt_ContractualObligationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_ContractualObligationAxis_28311d5e-0167-4cf9-8cfd-149505846318" xlink:to="loc_frt_ContractualObligationDomain_28311d5e-0167-4cf9-8cfd-149505846318_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ContractualObligationDomain_68a20c66-a345-4655-abf2-bfb0b7a33ea7" xlink:href="frt-20221231.xsd#frt_ContractualObligationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_ContractualObligationAxis_28311d5e-0167-4cf9-8cfd-149505846318" xlink:to="loc_frt_ContractualObligationDomain_68a20c66-a345-4655-abf2-bfb0b7a33ea7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CapitalImprovementDevelopmentAndRedevelopmentProjectsMember_68bfb62e-5b3c-4517-96e4-6d094a268bb1" xlink:href="frt-20221231.xsd#frt_CapitalImprovementDevelopmentAndRedevelopmentProjectsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ContractualObligationDomain_68a20c66-a345-4655-abf2-bfb0b7a33ea7" xlink:to="loc_frt_CapitalImprovementDevelopmentAndRedevelopmentProjectsMember_68bfb62e-5b3c-4517-96e4-6d094a268bb1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_ca6fd1dd-d00a-43f8-ba5c-bb821b8b65c2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_srt_StatementScenarioAxis_ca6fd1dd-d00a-43f8-ba5c-bb821b8b65c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_ca6fd1dd-d00a-43f8-ba5c-bb821b8b65c2_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_ca6fd1dd-d00a-43f8-ba5c-bb821b8b65c2" xlink:to="loc_srt_ScenarioUnspecifiedDomain_ca6fd1dd-d00a-43f8-ba5c-bb821b8b65c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_97c0e8cd-c610-4229-b54c-7d3e8c10e1ab" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_ca6fd1dd-d00a-43f8-ba5c-bb821b8b65c2" xlink:to="loc_srt_ScenarioUnspecifiedDomain_97c0e8cd-c610-4229-b54c-7d3e8c10e1ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_d6a5b597-6cce-4443-89b6-b556f1d95ef5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_97c0e8cd-c610-4229-b54c-7d3e8c10e1ab" xlink:to="loc_srt_ScenarioForecastMember_d6a5b597-6cce-4443-89b6-b556f1d95ef5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesAxis_c161ab1c-1d9d-40ef-a243-3c6c76e6223c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstatePropertiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_us-gaap_RealEstatePropertiesAxis_c161ab1c-1d9d-40ef-a243-3c6c76e6223c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesDomain_c161ab1c-1d9d-40ef-a243-3c6c76e6223c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstatePropertiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RealEstatePropertiesAxis_c161ab1c-1d9d-40ef-a243-3c6c76e6223c" xlink:to="loc_us-gaap_RealEstatePropertiesDomain_c161ab1c-1d9d-40ef-a243-3c6c76e6223c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstatePropertiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RealEstatePropertiesAxis_c161ab1c-1d9d-40ef-a243-3c6c76e6223c" xlink:to="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MercerMallMember_0d439c01-b03d-49f0-9a81-54db12d07354" xlink:href="frt-20221231.xsd#frt_MercerMallMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_MercerMallMember_0d439c01-b03d-49f0-9a81-54db12d07354" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CongressionalPlazaMember_6db2469c-b46c-49c7-9406-6f488c9e9d71" xlink:href="frt-20221231.xsd#frt_CongressionalPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_CongressionalPlazaMember_6db2469c-b46c-49c7-9406-6f488c9e9d71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MelvilleMallMember_a974318a-8022-43e1-b2f1-d2f09b8eb30b" xlink:href="frt-20221231.xsd#frt_MelvilleMallMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_MelvilleMallMember_a974318a-8022-43e1-b2f1-d2f09b8eb30b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TheGroveatShrewsburyMember_911549cf-b307-4e62-bf21-e3977d8c54c1" xlink:href="frt-20221231.xsd#frt_TheGroveatShrewsburyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_TheGroveatShrewsburyMember_911549cf-b307-4e62-bf21-e3977d8c54c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Brook35Member_6b9cf461-96b5-4322-9175-0246ed45013d" xlink:href="frt-20221231.xsd#frt_Brook35Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_Brook35Member_6b9cf461-96b5-4322-9175-0246ed45013d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GroveAtShrewsburyAndBrook35Member_674f3e7d-599c-4ff6-a849-6f3a8290ccb7" xlink:href="frt-20221231.xsd#frt_GroveAtShrewsburyAndBrook35Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_GroveAtShrewsburyAndBrook35Member_674f3e7d-599c-4ff6-a849-6f3a8290ccb7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HobokenMember_480d07af-c261-4bc1-b7e3-92fd635edf14" xlink:href="frt-20221231.xsd#frt_HobokenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_HobokenMember_480d07af-c261-4bc1-b7e3-92fd635edf14" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CamelbackColonnadeAndHiltonVillageMember_55713f3a-a77d-4325-952a-c826dd2f2889" xlink:href="frt-20221231.xsd#frt_CamelbackColonnadeAndHiltonVillageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_CamelbackColonnadeAndHiltonVillageMember_55713f3a-a77d-4325-952a-c826dd2f2889" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChandlerMember_3744faf5-67bf-4093-aeda-fc2d4a2a2318" xlink:href="frt-20221231.xsd#frt_ChandlerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_ChandlerMember_3744faf5-67bf-4093-aeda-fc2d4a2a2318" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GrossmontCenterMember_51232395-574e-44ce-9ced-7d7f8c98235a" xlink:href="frt-20221231.xsd#frt_GrossmontCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_a574f702-f73c-4d84-9c5f-50132df7e889" xlink:to="loc_frt_GrossmontCenterMember_51232395-574e-44ce-9ced-7d7f8c98235a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OptionByTypeAxis_b61ee998-b49e-45a1-9109-cd93408cc0e6" xlink:href="frt-20221231.xsd#frt_OptionByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_frt_OptionByTypeAxis_b61ee998-b49e-45a1-9109-cd93408cc0e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OptionByTypeDomain_b61ee998-b49e-45a1-9109-cd93408cc0e6_default" xlink:href="frt-20221231.xsd#frt_OptionByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_OptionByTypeAxis_b61ee998-b49e-45a1-9109-cd93408cc0e6" xlink:to="loc_frt_OptionByTypeDomain_b61ee998-b49e-45a1-9109-cd93408cc0e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OptionByTypeDomain_4a5dbccc-079d-487f-92c6-d8ce26394810" xlink:href="frt-20221231.xsd#frt_OptionByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_OptionByTypeAxis_b61ee998-b49e-45a1-9109-cd93408cc0e6" xlink:to="loc_frt_OptionByTypeDomain_4a5dbccc-079d-487f-92c6-d8ce26394810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PutOptionMember_dbdae409-fbcc-4eed-ba20-89eca6ee2ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PutOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_OptionByTypeDomain_4a5dbccc-079d-487f-92c6-d8ce26394810" xlink:to="loc_us-gaap_PutOptionMember_dbdae409-fbcc-4eed-ba20-89eca6ee2ff4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_bd65a815-30eb-49d1-b763-74ec0b6f3821" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_srt_RangeAxis_bd65a815-30eb-49d1-b763-74ec0b6f3821" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bd65a815-30eb-49d1-b763-74ec0b6f3821_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_bd65a815-30eb-49d1-b763-74ec0b6f3821" xlink:to="loc_srt_RangeMember_bd65a815-30eb-49d1-b763-74ec0b6f3821_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3482ee85-3dbd-40e4-8ce6-7867d4cec06f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_bd65a815-30eb-49d1-b763-74ec0b6f3821" xlink:to="loc_srt_RangeMember_3482ee85-3dbd-40e4-8ce6-7867d4cec06f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_3d6e7a5d-fc29-4c20-a6b0-48d73a9a2d9e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3482ee85-3dbd-40e4-8ce6-7867d4cec06f" xlink:to="loc_srt_MinimumMember_3d6e7a5d-fc29-4c20-a6b0-48d73a9a2d9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ead280fe-acde-4115-806e-e911534614eb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_3482ee85-3dbd-40e4-8ce6-7867d4cec06f" xlink:to="loc_srt_MaximumMember_ead280fe-acde-4115-806e-e911534614eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_a6af231d-c81f-448f-9e73-dc369122096e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_a6af231d-c81f-448f-9e73-dc369122096e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a6af231d-c81f-448f-9e73-dc369122096e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_a6af231d-c81f-448f-9e73-dc369122096e" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_a6af231d-c81f-448f-9e73-dc369122096e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0995f4c1-734a-4908-95c0-c3bf4bc27343" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_a6af231d-c81f-448f-9e73-dc369122096e" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0995f4c1-734a-4908-95c0-c3bf4bc27343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SanAntonioCenterMember_d9bd8978-2e10-415d-9c5e-fbf0fd163634" xlink:href="frt-20221231.xsd#frt_SanAntonioCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0995f4c1-734a-4908-95c0-c3bf4bc27343" xlink:to="loc_frt_SanAntonioCenterMember_d9bd8978-2e10-415d-9c5e-fbf0fd163634" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PlazaElSegundoMember_94ee7db5-5d34-4f1c-b5ae-6661646d9e45" xlink:href="frt-20221231.xsd#frt_PlazaElSegundoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0995f4c1-734a-4908-95c0-c3bf4bc27343" xlink:to="loc_frt_PlazaElSegundoMember_94ee7db5-5d34-4f1c-b5ae-6661646d9e45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_5a883db1-17c0-4554-b1bf-a6c27b5dc18a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_srt_OwnershipAxis_5a883db1-17c0-4554-b1bf-a6c27b5dc18a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_5a883db1-17c0-4554-b1bf-a6c27b5dc18a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_5a883db1-17c0-4554-b1bf-a6c27b5dc18a" xlink:to="loc_srt_OwnershipDomain_5a883db1-17c0-4554-b1bf-a6c27b5dc18a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_8d493410-f72b-4e39-a606-87ac0290b232" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_5a883db1-17c0-4554-b1bf-a6c27b5dc18a" xlink:to="loc_srt_OwnershipDomain_8d493410-f72b-4e39-a606-87ac0290b232" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RedeemableNoncontrollingInterestsMember_f3f7a02d-a892-41f0-aa99-891d7d3e3094" xlink:href="frt-20221231.xsd#frt_RedeemableNoncontrollingInterestsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_8d493410-f72b-4e39-a606-87ac0290b232" xlink:to="loc_frt_RedeemableNoncontrollingInterestsMember_f3f7a02d-a892-41f0-aa99-891d7d3e3094" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeAxis_ace85c40-2476-4a9d-852e-05f5f0893dee" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_521a251a-e399-4ca1-b169-28e2e1dbadc3" xlink:to="loc_frt_ConvertibleUnitTypeAxis_ace85c40-2476-4a9d-852e-05f5f0893dee" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeDomain_ace85c40-2476-4a9d-852e-05f5f0893dee_default" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_ConvertibleUnitTypeAxis_ace85c40-2476-4a9d-852e-05f5f0893dee" xlink:to="loc_frt_ConvertibleUnitTypeDomain_ace85c40-2476-4a9d-852e-05f5f0893dee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertibleUnitTypeDomain_7d4bb61d-b88b-418b-8653-fa81cef8646d" xlink:href="frt-20221231.xsd#frt_ConvertibleUnitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_ConvertibleUnitTypeAxis_ace85c40-2476-4a9d-852e-05f5f0893dee" xlink:to="loc_frt_ConvertibleUnitTypeDomain_7d4bb61d-b88b-418b-8653-fa81cef8646d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DownREITOPUnitsMember_70b53282-c278-4992-a158-5849baacab05" xlink:href="frt-20221231.xsd#frt_DownREITOPUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ConvertibleUnitTypeDomain_7d4bb61d-b88b-418b-8653-fa81cef8646d" xlink:to="loc_frt_DownREITOPUnitsMember_70b53282-c278-4992-a158-5849baacab05" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ShareholdersEquityDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#ShareholdersEquityDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ShareholdersEquityDetails" xlink:type="extended" id="i0ea92f3e8c174da491232260134584a8_ShareholdersEquityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_70dd2676-a812-46ab-801c-70767ad1cff0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_70dd2676-a812-46ab-801c-70767ad1cff0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_37b4d7c2-6e6c-4b3b-b738-11f5718d8d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_37b4d7c2-6e6c-4b3b-b738-11f5718d8d8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_e1042d63-a770-4cba-8aad-dda87e609cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_e1042d63-a770-4cba-8aad-dda87e609cb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_4a2c1a3c-1322-4fd1-853f-08ec8b204ad5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_4a2c1a3c-1322-4fd1-853f-08ec8b204ad5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_663d30e0-fbce-49b8-a0f0-dd1014b11d0a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_663d30e0-fbce-49b8-a0f0-dd1014b11d0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_2e84df2f-747c-41e7-bacb-799e7455ffd2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_2e84df2f-747c-41e7-bacb-799e7455ffd2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ConvertiblePreferredStockConversionPricePerShare_7367a9e1-4c28-4b7b-ae5a-69d04c65b397" xlink:href="frt-20221231.xsd#frt_ConvertiblePreferredStockConversionPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_frt_ConvertiblePreferredStockConversionPricePerShare_7367a9e1-4c28-4b7b-ae5a-69d04c65b397" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_6f8a442e-1a2d-4476-bb3e-116110f7bf5e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConversionOfStockSharesConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_ConversionOfStockSharesConverted1_6f8a442e-1a2d-4476-bb3e-116110f7bf5e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_afcc6d84-c948-41d6-b5a2-419e0ea408f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_afcc6d84-c948-41d6-b5a2-419e0ea408f8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AggregateOfferingPriceOfCommonShare_0e1f1f64-c0c8-489e-9349-421a264ba1ba" xlink:href="frt-20221231.xsd#frt_AggregateOfferingPriceOfCommonShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_frt_AggregateOfferingPriceOfCommonShare_0e1f1f64-c0c8-489e-9349-421a264ba1ba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_285c6962-98d4-4a6e-bbed-cfbb22037d17" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_285c6962-98d4-4a6e-bbed-cfbb22037d17" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WeightedAveragePricePerCommonShare_37eccc2d-916e-4915-a137-1e044fac5492" xlink:href="frt-20221231.xsd#frt_WeightedAveragePricePerCommonShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_frt_WeightedAveragePricePerCommonShare_37eccc2d-916e-4915-a137-1e044fac5492" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_a461b0e8-9260-4ad4-9284-9d3cdbbb6a11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_a461b0e8-9260-4ad4-9284-9d3cdbbb6a11" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RemainingCapacityToIssue_8f8af2e6-66af-42b3-bab3-8f62682f6e32" xlink:href="frt-20221231.xsd#frt_RemainingCapacityToIssue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_frt_RemainingCapacityToIssue_8f8af2e6-66af-42b3-bab3-8f62682f6e32" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractIndexedToIssuersEquityShares_17313f37-7656-4404-93a4-bf83a3a6c57e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForwardContractIndexedToIssuersEquityShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_ForwardContractIndexedToIssuersEquityShares_17313f37-7656-4404-93a4-bf83a3a6c57e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_ed38d306-64e1-4718-9559-dd780a5305f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_28c21fe4-5e0f-4528-81a7-7097da38eca6" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_ed38d306-64e1-4718-9559-dd780a5305f1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_3b46accc-464a-40f0-a499-24231d10ad9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_ed38d306-64e1-4718-9559-dd780a5305f1" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_3b46accc-464a-40f0-a499-24231d10ad9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3b46accc-464a-40f0-a499-24231d10ad9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3b46accc-464a-40f0-a499-24231d10ad9b" xlink:to="loc_us-gaap_EquityComponentDomain_3b46accc-464a-40f0-a499-24231d10ad9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_73cdc6d3-a81b-4359-9be7-47b8889757e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3b46accc-464a-40f0-a499-24231d10ad9b" xlink:to="loc_us-gaap_EquityComponentDomain_73cdc6d3-a81b-4359-9be7-47b8889757e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_ef42af74-44bc-4495-8a27-48b55050e32a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_73cdc6d3-a81b-4359-9be7-47b8889757e9" xlink:to="loc_us-gaap_PreferredStockMember_ef42af74-44bc-4495-8a27-48b55050e32a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredUnitsByNameAxis_d104fe01-eb57-42d1-b7ad-948b5fded3e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredUnitsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_ed38d306-64e1-4718-9559-dd780a5305f1" xlink:to="loc_us-gaap_PreferredUnitsByNameAxis_d104fe01-eb57-42d1-b7ad-948b5fded3e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredUnitsClassDomain_d104fe01-eb57-42d1-b7ad-948b5fded3e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredUnitsClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PreferredUnitsByNameAxis_d104fe01-eb57-42d1-b7ad-948b5fded3e7" xlink:to="loc_us-gaap_PreferredUnitsClassDomain_d104fe01-eb57-42d1-b7ad-948b5fded3e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredUnitsClassDomain_810a4a7c-180d-4fa7-9345-c6f71d3cf594" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredUnitsClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PreferredUnitsByNameAxis_d104fe01-eb57-42d1-b7ad-948b5fded3e7" xlink:to="loc_us-gaap_PreferredUnitsClassDomain_810a4a7c-180d-4fa7-9345-c6f71d3cf594" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DepositorySharesMember_73c165ba-2dfc-4b96-89c2-2c409c197267" xlink:href="frt-20221231.xsd#frt_DepositorySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsClassDomain_810a4a7c-180d-4fa7-9345-c6f71d3cf594" xlink:to="loc_frt_DepositorySharesMember_73c165ba-2dfc-4b96-89c2-2c409c197267" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_3a203964-0480-4ad8-978a-6c1a15fa2e33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_ed38d306-64e1-4718-9559-dd780a5305f1" xlink:to="loc_us-gaap_StatementClassOfStockAxis_3a203964-0480-4ad8-978a-6c1a15fa2e33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3a203964-0480-4ad8-978a-6c1a15fa2e33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3a203964-0480-4ad8-978a-6c1a15fa2e33" xlink:to="loc_us-gaap_ClassOfStockDomain_3a203964-0480-4ad8-978a-6c1a15fa2e33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_ee4e7d5f-58eb-4259-9b86-e80c605c3690" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3a203964-0480-4ad8-978a-6c1a15fa2e33" xlink:to="loc_us-gaap_ClassOfStockDomain_ee4e7d5f-58eb-4259-9b86-e80c605c3690" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_b0531061-8d18-48d8-80dd-ffbed1a515dd" xlink:href="frt-20221231.xsd#frt_A5.0SeriesCCumulativeRedeemablePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_ee4e7d5f-58eb-4259-9b86-e80c605c3690" xlink:to="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_b0531061-8d18-48d8-80dd-ffbed1a515dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_2423c94e-ba22-414d-b671-ee202fb54da9" xlink:href="frt-20221231.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_ee4e7d5f-58eb-4259-9b86-e80c605c3690" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_2423c94e-ba22-414d-b671-ee202fb54da9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_6fd07ba7-b02e-421c-bc11-d6c4581dbf61" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_ee4e7d5f-58eb-4259-9b86-e80c605c3690" xlink:to="loc_us-gaap_CommonStockMember_6fd07ba7-b02e-421c-bc11-d6c4581dbf61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_8cde7a82-dc44-4b41-8599-f4509801244b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_ed38d306-64e1-4718-9559-dd780a5305f1" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_8cde7a82-dc44-4b41-8599-f4509801244b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_8cde7a82-dc44-4b41-8599-f4509801244b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_8cde7a82-dc44-4b41-8599-f4509801244b" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_8cde7a82-dc44-4b41-8599-f4509801244b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_247dd435-6cf7-4617-a98c-a9549fff14c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_8cde7a82-dc44-4b41-8599-f4509801244b" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_247dd435-6cf7-4617-a98c-a9549fff14c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AtMarketEquityProgramMember_3547cfa3-0c22-42ea-bcbf-d6c50ce532cb" xlink:href="frt-20221231.xsd#frt_AtMarketEquityProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_247dd435-6cf7-4617-a98c-a9549fff14c1" xlink:to="loc_frt_AtMarketEquityProgramMember_3547cfa3-0c22-42ea-bcbf-d6c50ce532cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ForwardSalesContractsMember_c2f73bee-08bc-4a46-908a-d681d049af20" xlink:href="frt-20221231.xsd#frt_ForwardSalesContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_247dd435-6cf7-4617-a98c-a9549fff14c1" xlink:to="loc_frt_ForwardSalesContractsMember_c2f73bee-08bc-4a46-908a-d681d049af20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_StockIssuanceCostsByTypeAxis_eae921cc-95a6-43c9-9c1c-1f411acf3551" xlink:href="frt-20221231.xsd#frt_StockIssuanceCostsByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_ed38d306-64e1-4718-9559-dd780a5305f1" xlink:to="loc_frt_StockIssuanceCostsByTypeAxis_eae921cc-95a6-43c9-9c1c-1f411acf3551" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_StockIssuanceCostsByTypeDomain_eae921cc-95a6-43c9-9c1c-1f411acf3551_default" xlink:href="frt-20221231.xsd#frt_StockIssuanceCostsByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_StockIssuanceCostsByTypeAxis_eae921cc-95a6-43c9-9c1c-1f411acf3551" xlink:to="loc_frt_StockIssuanceCostsByTypeDomain_eae921cc-95a6-43c9-9c1c-1f411acf3551_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_StockIssuanceCostsByTypeDomain_9c112ac9-858a-49af-8e6a-32812d35af88" xlink:href="frt-20221231.xsd#frt_StockIssuanceCostsByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_StockIssuanceCostsByTypeAxis_eae921cc-95a6-43c9-9c1c-1f411acf3551" xlink:to="loc_frt_StockIssuanceCostsByTypeDomain_9c112ac9-858a-49af-8e6a-32812d35af88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommissionsMember_2140ccfb-a061-4e84-9e00-d79904ca7fb3" xlink:href="frt-20221231.xsd#frt_CommissionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_StockIssuanceCostsByTypeDomain_9c112ac9-858a-49af-8e6a-32812d35af88" xlink:to="loc_frt_CommissionsMember_2140ccfb-a061-4e84-9e00-d79904ca7fb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OtherOfferingCostsMember_50394dbf-03de-4f5a-9e58-129817f6941b" xlink:href="frt-20221231.xsd#frt_OtherOfferingCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_StockIssuanceCostsByTypeDomain_9c112ac9-858a-49af-8e6a-32812d35af88" xlink:to="loc_frt_OtherOfferingCostsMember_50394dbf-03de-4f5a-9e58-129817f6941b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/DividendsDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#DividendsDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/DividendsDetails" xlink:type="extended" id="id2e70f5af6ee4a7aa262b3f670b51f4f_DividendsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_9550d88a-9d85-400d-b8d7-982af6bbade9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_9550d88a-9d85-400d-b8d7-982af6bbade9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_18dc9a5a-b4d0-43ac-a205-566166e6e7f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_18dc9a5a-b4d0-43ac-a205-566166e6e7f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_9f81ddf2-d963-46f3-b577-6842a46753cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_9f81ddf2-d963-46f3-b577-6842a46753cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareDeclared_a2fddc56-73cc-47ec-8c71-8f16d849d2bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareDeclared_a2fddc56-73cc-47ec-8c71-8f16d849d2bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_df96036f-11d8-41cd-98f9-0b40aaa36d88" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_df96036f-11d8-41cd-98f9-0b40aaa36d88" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonStockOrdinaryDividendsPerShareCashPaid_ab1a2b4b-b031-4350-8a56-45c294f67caf" xlink:href="frt-20221231.xsd#frt_CommonStockOrdinaryDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_frt_CommonStockOrdinaryDividendsPerShareCashPaid_ab1a2b4b-b031-4350-8a56-45c294f67caf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonSharesCapitalGain_ad883324-754e-4bc2-9a62-53c46d4e3392" xlink:href="frt-20221231.xsd#frt_CommonSharesCapitalGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_frt_CommonSharesCapitalGain_ad883324-754e-4bc2-9a62-53c46d4e3392" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonSharesReturnOfCapital_f27e8040-e8fc-46c7-a894-11428f5c554e" xlink:href="frt-20221231.xsd#frt_CommonSharesReturnOfCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_frt_CommonSharesReturnOfCapital_f27e8040-e8fc-46c7-a894-11428f5c554e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PreferredStockOrdinaryDividendsPerShareCashPaid_8f9aebf0-0ee1-4af8-8d99-390c6a16f02c" xlink:href="frt-20221231.xsd#frt_PreferredStockOrdinaryDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_frt_PreferredStockOrdinaryDividendsPerShareCashPaid_8f9aebf0-0ee1-4af8-8d99-390c6a16f02c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PreferredSharesCapitalGain_443cb9c9-98f9-4e50-bd2c-255e29c452de" xlink:href="frt-20221231.xsd#frt_PreferredSharesCapitalGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_frt_PreferredSharesCapitalGain_443cb9c9-98f9-4e50-bd2c-255e29c452de" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_395e7f2d-cac0-437b-aa40-62ae1178d8d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_87a7825d-d5fd-4a07-9842-950574c5cfff" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_395e7f2d-cac0-437b-aa40-62ae1178d8d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_efeec19f-fee6-4638-8f3b-5c29d9e40027" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_395e7f2d-cac0-437b-aa40-62ae1178d8d4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_efeec19f-fee6-4638-8f3b-5c29d9e40027" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_efeec19f-fee6-4638-8f3b-5c29d9e40027_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_efeec19f-fee6-4638-8f3b-5c29d9e40027" xlink:to="loc_us-gaap_ClassOfStockDomain_efeec19f-fee6-4638-8f3b-5c29d9e40027_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_0f29b0f3-e477-43ba-b581-a08fdaa8778f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_efeec19f-fee6-4638-8f3b-5c29d9e40027" xlink:to="loc_us-gaap_ClassOfStockDomain_0f29b0f3-e477-43ba-b581-a08fdaa8778f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_6a0de2a8-0e15-4649-9b40-f14ddafde253" xlink:href="frt-20221231.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_0f29b0f3-e477-43ba-b581-a08fdaa8778f" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_6a0de2a8-0e15-4649-9b40-f14ddafde253" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_adfbc0f6-a338-4e0c-99eb-0ec5c652d30f" xlink:href="frt-20221231.xsd#frt_A5.0SeriesCCumulativeRedeemablePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_0f29b0f3-e477-43ba-b581-a08fdaa8778f" xlink:to="loc_frt_A5.0SeriesCCumulativeRedeemablePreferredMember_adfbc0f6-a338-4e0c-99eb-0ec5c652d30f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/OperatingLeasesDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#OperatingLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/OperatingLeasesDetails" xlink:type="extended" id="i3d49fe13f01042938c47a1d1608665f4_OperatingLeasesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRealEstateProperties_4c00a03a-18bb-42d0-97f4-b71c6f9d6986" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfRealEstateProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:to="loc_us-gaap_NumberOfRealEstateProperties_4c00a03a-18bb-42d0-97f4-b71c6f9d6986" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfStatesInWhichEntityOperates_db48b9c9-0ad1-467d-a2c6-90cc7752ac7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfStatesInWhichEntityOperates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:to="loc_us-gaap_NumberOfStatesInWhichEntityOperates_db48b9c9-0ad1-467d-a2c6-90cc7752ac7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NumberOfLeases_3acea429-a048-45d5-8c91-a9c6265ebe05" xlink:href="frt-20221231.xsd#frt_NumberOfLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:to="loc_frt_NumberOfLeases_3acea429-a048-45d5-8c91-a9c6265ebe05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PercentOfAnnualizedBaseRentMaximum_c522467a-a546-46b8-89c2-8dddba2bb3f1" xlink:href="frt-20221231.xsd#frt_PercentOfAnnualizedBaseRentMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:to="loc_frt_PercentOfAnnualizedBaseRentMaximum_c522467a-a546-46b8-89c2-8dddba2bb3f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OperatingLeaseTerm_56c78f70-9bd5-487d-9a06-0fc08472ae66" xlink:href="frt-20221231.xsd#frt_OperatingLeaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:to="loc_frt_OperatingLeaseTerm_56c78f70-9bd5-487d-9a06-0fc08472ae66" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_67386748-8e63-4bc9-8b2a-f49982985404" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_67386748-8e63-4bc9-8b2a-f49982985404" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_a773281f-cabd-4fc0-b86e-74330c90783a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_a773281f-cabd-4fc0-b86e-74330c90783a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_d1f9cd20-504b-4ba8-996a-887a7b414853" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_d1f9cd20-504b-4ba8-996a-887a7b414853" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_c7699d85-4870-4c53-89d2-6d8cbebaa7a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_c7699d85-4870-4c53-89d2-6d8cbebaa7a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_4bc5f183-a90f-4227-a679-557fc074dacf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_4bc5f183-a90f-4227-a679-557fc074dacf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_d222665b-84b2-4a23-a000-7feb0b7f13a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_d222665b-84b2-4a23-a000-7feb0b7f13a3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1fafd07d-502d-4583-bf80-102cb3d1acc0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_6b345761-7f97-4f81-9299-cc7d3622ae41" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1fafd07d-502d-4583-bf80-102cb3d1acc0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_d54e8057-9730-452d-8806-3348ab214dee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_fae4812e-a9ae-454a-a1ba-c4e54a430a55" xlink:to="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_d54e8057-9730-452d-8806-3348ab214dee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RealEstateInvestmentsByPropertyTypeAxis_54b9b014-c85c-4b15-82c3-c7ac6a1a9b82" xlink:href="frt-20221231.xsd#frt_RealEstateInvestmentsByPropertyTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_d54e8057-9730-452d-8806-3348ab214dee" xlink:to="loc_frt_RealEstateInvestmentsByPropertyTypeAxis_54b9b014-c85c-4b15-82c3-c7ac6a1a9b82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RealEstateInvestmentsByPropertyTypeDomain_54b9b014-c85c-4b15-82c3-c7ac6a1a9b82_default" xlink:href="frt-20221231.xsd#frt_RealEstateInvestmentsByPropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_RealEstateInvestmentsByPropertyTypeAxis_54b9b014-c85c-4b15-82c3-c7ac6a1a9b82" xlink:to="loc_frt_RealEstateInvestmentsByPropertyTypeDomain_54b9b014-c85c-4b15-82c3-c7ac6a1a9b82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RealEstateInvestmentsByPropertyTypeDomain_33d07f50-0c75-4846-801a-50d3d855dee0" xlink:href="frt-20221231.xsd#frt_RealEstateInvestmentsByPropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_RealEstateInvestmentsByPropertyTypeAxis_54b9b014-c85c-4b15-82c3-c7ac6a1a9b82" xlink:to="loc_frt_RealEstateInvestmentsByPropertyTypeDomain_33d07f50-0c75-4846-801a-50d3d855dee0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstateMember_138b6e7b-8fe6-4478-9a0b-3253bbe6c845" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstateInvestmentsByPropertyTypeDomain_33d07f50-0c75-4846-801a-50d3d855dee0" xlink:to="loc_us-gaap_CommercialRealEstateMember_138b6e7b-8fe6-4478-9a0b-3253bbe6c845" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_2c4eba45-d5ae-4604-a9bc-cbf8381ebc13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstateInvestmentsByPropertyTypeDomain_33d07f50-0c75-4846-801a-50d3d855dee0" xlink:to="loc_us-gaap_ResidentialRealEstateMember_2c4eba45-d5ae-4604-a9bc-cbf8381ebc13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_4c096955-3ba4-4289-b1e9-f1a719814267" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_d54e8057-9730-452d-8806-3348ab214dee" xlink:to="loc_srt_RangeAxis_4c096955-3ba4-4289-b1e9-f1a719814267" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4c096955-3ba4-4289-b1e9-f1a719814267_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_4c096955-3ba4-4289-b1e9-f1a719814267" xlink:to="loc_srt_RangeMember_4c096955-3ba4-4289-b1e9-f1a719814267_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6f40dec2-d886-4284-bde1-ebe79c362fd3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_4c096955-3ba4-4289-b1e9-f1a719814267" xlink:to="loc_srt_RangeMember_6f40dec2-d886-4284-bde1-ebe79c362fd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a8c40e1b-8485-4f4c-ab9c-dc3190c1c9d7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6f40dec2-d886-4284-bde1-ebe79c362fd3" xlink:to="loc_srt_MinimumMember_a8c40e1b-8485-4f4c-ab9c-dc3190c1c9d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a4e5e2f3-e9d8-4826-a471-133e2a1f82ca" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6f40dec2-d886-4284-bde1-ebe79c362fd3" xlink:to="loc_srt_MaximumMember_a4e5e2f3-e9d8-4826-a471-133e2a1f82ca" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ShareBasedCompensationPlansRestrictedShareActivityDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#ShareBasedCompensationPlansRestrictedShareActivityDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ShareBasedCompensationPlansRestrictedShareActivityDetails" xlink:type="extended" id="idaaaf1577ca14fa0b3875b97c45caa5b_ShareBasedCompensationPlansRestrictedShareActivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_113c255b-a52a-47b1-8703-b9d6d163b247" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_113c255b-a52a-47b1-8703-b9d6d163b247" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_eb59a3a8-05bf-43d0-b254-ffbec14e93db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_eb59a3a8-05bf-43d0-b254-ffbec14e93db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_744f12a5-188e-495a-91b4-02504e126434" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_744f12a5-188e-495a-91b4-02504e126434" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_fd04958f-78fa-41d0-b0f9-b7974eee016c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_fd04958f-78fa-41d0-b0f9-b7974eee016c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5b41c83d-26e7-4ce3-ac2f-c24c96f6f2ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5b41c83d-26e7-4ce3-ac2f-c24c96f6f2ec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_88efcd66-1525-4f85-8f9a-3809f08fefac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a5016497-4bb9-4b9f-acdf-1af31976b946" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_a5016497-4bb9-4b9f-acdf-1af31976b946" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_38cf0e7d-21f5-41e5-b8b8-d1194d8aefa7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_38cf0e7d-21f5-41e5-b8b8-d1194d8aefa7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_8e8eadbd-ef11-481a-a03b-39bcd9955ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_8e8eadbd-ef11-481a-a03b-39bcd9955ef7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_9974a2a8-b73f-4b9e-ae0f-6ddab4c6b1bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_9a62ded0-3e27-4e6c-8e29-b37ddeb37f80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_9974a2a8-b73f-4b9e-ae0f-6ddab4c6b1bd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_97486d7a-b1bb-4844-96f0-f5bfac3bfcc7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_c2fbb35e-9833-4a24-b8a8-17255f3814b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cbce8de6-69f2-4c5a-86c4-04d10ca2cf83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_113c255b-a52a-47b1-8703-b9d6d163b247" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cbce8de6-69f2-4c5a-86c4-04d10ca2cf83" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e0fb3294-8317-44ab-a1fd-9c1b0ef9fd74" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_cbce8de6-69f2-4c5a-86c4-04d10ca2cf83" xlink:to="loc_us-gaap_AwardTypeAxis_e0fb3294-8317-44ab-a1fd-9c1b0ef9fd74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e0fb3294-8317-44ab-a1fd-9c1b0ef9fd74_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e0fb3294-8317-44ab-a1fd-9c1b0ef9fd74" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e0fb3294-8317-44ab-a1fd-9c1b0ef9fd74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_458cc4f0-3cc9-4215-bb58-d76ca962ae7c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e0fb3294-8317-44ab-a1fd-9c1b0ef9fd74" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_458cc4f0-3cc9-4215-bb58-d76ca962ae7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_3141c80b-9daf-4665-b79f-0e7eb323f708" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_458cc4f0-3cc9-4215-bb58-d76ca962ae7c" xlink:to="loc_us-gaap_RestrictedStockMember_3141c80b-9daf-4665-b79f-0e7eb323f708" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ShareBasedCompensationPlansRestrictedStockUnitsActivityDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#ShareBasedCompensationPlansRestrictedStockUnitsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ShareBasedCompensationPlansRestrictedStockUnitsActivityDetails" xlink:type="extended" id="if3027c51b28a4519b6fcb8c4c91513d3_ShareBasedCompensationPlansRestrictedStockUnitsActivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f6596686-68f5-4b33-82af-ff562ecc47c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f6596686-68f5-4b33-82af-ff562ecc47c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1e969022-d08b-40c7-b230-543e50133826" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1e969022-d08b-40c7-b230-543e50133826" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_eff6d5c3-bd8e-430e-b0fe-85c7f8a90833" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_eff6d5c3-bd8e-430e-b0fe-85c7f8a90833" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_844745eb-311a-43f4-971f-43b24380d8cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_844745eb-311a-43f4-971f-43b24380d8cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0b6c6970-aeef-4525-b07e-cebb9bb505f2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_0b6c6970-aeef-4525-b07e-cebb9bb505f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5096ea47-4582-4029-856e-e58364da588c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9885db39-2c5b-4668-bb11-9dbfd257a57e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9885db39-2c5b-4668-bb11-9dbfd257a57e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_209b0d2a-f8e6-4af1-ac87-742c126d012d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_209b0d2a-f8e6-4af1-ac87-742c126d012d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0c7ff6e9-de59-4e46-a5b0-eb2c3f7a22d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0c7ff6e9-de59-4e46-a5b0-eb2c3f7a22d9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_2d513058-f30c-492c-b186-6fc288b55da6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1067fd34-f0d4-43d1-ab6e-d0da6cc295db" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_2d513058-f30c-492c-b186-6fc288b55da6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_ba5d85a4-43c3-4437-9518-b594343e84eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4ccebe14-d6bd-4998-b33d-bcb63b42958f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f6596686-68f5-4b33-82af-ff562ecc47c3" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4ccebe14-d6bd-4998-b33d-bcb63b42958f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_8ae3eb01-e38b-4f32-a131-168d198103a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4ccebe14-d6bd-4998-b33d-bcb63b42958f" xlink:to="loc_us-gaap_AwardTypeAxis_8ae3eb01-e38b-4f32-a131-168d198103a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8ae3eb01-e38b-4f32-a131-168d198103a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8ae3eb01-e38b-4f32-a131-168d198103a1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8ae3eb01-e38b-4f32-a131-168d198103a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_feacc0ca-8176-4301-9100-3a80eee8369d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8ae3eb01-e38b-4f32-a131-168d198103a1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_feacc0ca-8176-4301-9100-3a80eee8369d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_e4bf9b5c-4c11-4d87-8b9d-35bea733937e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_feacc0ca-8176-4301-9100-3a80eee8369d" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_e4bf9b5c-4c11-4d87-8b9d-35bea733937e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_b0e40f6f-2ba6-405b-8dc2-59181694bfb3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4ccebe14-d6bd-4998-b33d-bcb63b42958f" xlink:to="loc_srt_TitleOfIndividualAxis_b0e40f6f-2ba6-405b-8dc2-59181694bfb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_b0e40f6f-2ba6-405b-8dc2-59181694bfb3_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_b0e40f6f-2ba6-405b-8dc2-59181694bfb3" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_b0e40f6f-2ba6-405b-8dc2-59181694bfb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3d9ff7a1-b985-4734-829e-ed5a31da6ef3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_b0e40f6f-2ba6-405b-8dc2-59181694bfb3" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3d9ff7a1-b985-4734-829e-ed5a31da6ef3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OfficerMember_7f5f7843-9b4f-4a2f-a34b-a9ff975281ba" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3d9ff7a1-b985-4734-829e-ed5a31da6ef3" xlink:to="loc_srt_OfficerMember_7f5f7843-9b4f-4a2f-a34b-a9ff975281ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_196f9ab1-b2eb-4f9f-9429-959d2b47b1d0" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4ccebe14-d6bd-4998-b33d-bcb63b42958f" xlink:to="loc_srt_RangeAxis_196f9ab1-b2eb-4f9f-9429-959d2b47b1d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_196f9ab1-b2eb-4f9f-9429-959d2b47b1d0_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_196f9ab1-b2eb-4f9f-9429-959d2b47b1d0" xlink:to="loc_srt_RangeMember_196f9ab1-b2eb-4f9f-9429-959d2b47b1d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_634089aa-02ed-497b-9ffd-5871dbc59a86" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_196f9ab1-b2eb-4f9f-9429-959d2b47b1d0" xlink:to="loc_srt_RangeMember_634089aa-02ed-497b-9ffd-5871dbc59a86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_70338abe-a1ac-4eac-bb8b-af4d2606269d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_634089aa-02ed-497b-9ffd-5871dbc59a86" xlink:to="loc_srt_MinimumMember_70338abe-a1ac-4eac-bb8b-af4d2606269d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_fa41ad95-b240-440e-9f52-9c0bdb85361a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_634089aa-02ed-497b-9ffd-5871dbc59a86" xlink:to="loc_srt_MaximumMember_fa41ad95-b240-440e-9f52-9c0bdb85361a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ShareBasedCompensationPlansCommonSharesAwardedUnderVariousCompensationPlansDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#ShareBasedCompensationPlansCommonSharesAwardedUnderVariousCompensationPlansDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ShareBasedCompensationPlansCommonSharesAwardedUnderVariousCompensationPlansDetails" xlink:type="extended" id="i234fd5f5a8584b33a586b0f28d5db6f1_ShareBasedCompensationPlansCommonSharesAwardedUnderVariousCompensationPlansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3aca020c-d7d7-410e-a93e-0b49ee4d66f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_e5edde1a-fbc2-43af-bc50-d8467a89b0b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3aca020c-d7d7-410e-a93e-0b49ee4d66f7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_e5edde1a-fbc2-43af-bc50-d8467a89b0b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_f5bc3978-446a-4b60-90bc-62d532ad09ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3aca020c-d7d7-410e-a93e-0b49ee4d66f7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_f5bc3978-446a-4b60-90bc-62d532ad09ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1e0d356-d237-44d6-9478-f0592e971f00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3aca020c-d7d7-410e-a93e-0b49ee4d66f7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1e0d356-d237-44d6-9478-f0592e971f00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_942728c0-239c-48cc-8612-4ebb1787e7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1e0d356-d237-44d6-9478-f0592e971f00" xlink:to="loc_us-gaap_AwardTypeAxis_942728c0-239c-48cc-8612-4ebb1787e7ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_942728c0-239c-48cc-8612-4ebb1787e7ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_942728c0-239c-48cc-8612-4ebb1787e7ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_942728c0-239c-48cc-8612-4ebb1787e7ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_223648d0-3cd8-46ec-ae08-0e2b82fbb247" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_942728c0-239c-48cc-8612-4ebb1787e7ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_223648d0-3cd8-46ec-ae08-0e2b82fbb247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_e8136ebf-163d-44ab-8ff1-fb9ebd73ad2b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_223648d0-3cd8-46ec-ae08-0e2b82fbb247" xlink:to="loc_us-gaap_RestrictedStockMember_e8136ebf-163d-44ab-8ff1-fb9ebd73ad2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_94369c92-898b-4b2b-b60b-14bd55e499f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_223648d0-3cd8-46ec-ae08-0e2b82fbb247" xlink:to="loc_us-gaap_EmployeeStockOptionMember_94369c92-898b-4b2b-b60b-14bd55e499f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_bc433d3e-49e8-4c99-aca7-2b32a6302741" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_223648d0-3cd8-46ec-ae08-0e2b82fbb247" xlink:to="loc_us-gaap_StockCompensationPlanMember_bc433d3e-49e8-4c99-aca7-2b32a6302741" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_10bad72d-015a-4c25-9515-d3bbf2a60950" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1e0d356-d237-44d6-9478-f0592e971f00" xlink:to="loc_srt_RangeAxis_10bad72d-015a-4c25-9515-d3bbf2a60950" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_10bad72d-015a-4c25-9515-d3bbf2a60950_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_10bad72d-015a-4c25-9515-d3bbf2a60950" xlink:to="loc_srt_RangeMember_10bad72d-015a-4c25-9515-d3bbf2a60950_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5c39cc2d-75e2-4844-9645-2c67bb6e7327" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_10bad72d-015a-4c25-9515-d3bbf2a60950" xlink:to="loc_srt_RangeMember_5c39cc2d-75e2-4844-9645-2c67bb6e7327" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b2171ef2-3e3c-410b-bf85-d6f6d9646c08" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_5c39cc2d-75e2-4844-9645-2c67bb6e7327" xlink:to="loc_srt_MinimumMember_b2171ef2-3e3c-410b-bf85-d6f6d9646c08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_34da3782-aab8-4580-9883-1b4da0ec6af3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_5c39cc2d-75e2-4844-9645-2c67bb6e7327" xlink:to="loc_srt_MaximumMember_34da3782-aab8-4580-9883-1b4da0ec6af3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_e6fb618f-b5b3-4b0c-85f7-35b1eb70bff6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b1e0d356-d237-44d6-9478-f0592e971f00" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_e6fb618f-b5b3-4b0c-85f7-35b1eb70bff6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_e6fb618f-b5b3-4b0c-85f7-35b1eb70bff6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_e6fb618f-b5b3-4b0c-85f7-35b1eb70bff6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_e6fb618f-b5b3-4b0c-85f7-35b1eb70bff6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_f1b94663-8ab3-4f88-a198-89fbc66cfb3f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_e6fb618f-b5b3-4b0c-85f7-35b1eb70bff6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_f1b94663-8ab3-4f88-a198-89fbc66cfb3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_aa5df84b-6b17-42e6-a16e-f90bde8b17aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_f1b94663-8ab3-4f88-a198-89fbc66cfb3f" xlink:to="loc_us-gaap_SubsequentEventMember_aa5df84b-6b17-42e6-a16e-f90bde8b17aa" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ShareBasedCompensationPlansNarrativeDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#ShareBasedCompensationPlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ShareBasedCompensationPlansNarrativeDetails" xlink:type="extended" id="ic9adba23020b4c9f8d466cd4c4315026_ShareBasedCompensationPlansNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_fcd5c245-4a54-4fa4-b823-d6ea55151176" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_fcd5c245-4a54-4fa4-b823-d6ea55151176" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_79c22963-7642-43f9-9256-27436648b76e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_79c22963-7642-43f9-9256-27436648b76e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_95267efc-91a2-47ee-8bf3-348affeea8c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_95267efc-91a2-47ee-8bf3-348affeea8c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_a3da97ed-c64d-4288-898c-8d188f02e2e5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_a3da97ed-c64d-4288-898c-8d188f02e2e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6a5e15c0-458a-4dc5-9b8c-5415ec82b6c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6a5e15c0-458a-4dc5-9b8c-5415ec82b6c8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3ad78a61-da5c-4aef-9c0e-5196a57ec96c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3ad78a61-da5c-4aef-9c0e-5196a57ec96c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_c8348e55-d5da-47ea-9735-c8f8b6ff6e92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_c8348e55-d5da-47ea-9735-c8f8b6ff6e92" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_4796de27-2542-444e-9bce-d1a194bb9827" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_4796de27-2542-444e-9bce-d1a194bb9827" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_a3708291-e6d2-42cc-9d53-be8da7c0c359" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_a3708291-e6d2-42cc-9d53-be8da7c0c359" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_3114d6d0-ff35-4a53-a523-39b78f87b01c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_3114d6d0-ff35-4a53-a523-39b78f87b01c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionYears_1fc27cc6-efa9-41bc-9d8d-6726567fd597" xlink:href="frt-20221231.xsd#frt_ShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_frt_ShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionYears_1fc27cc6-efa9-41bc-9d8d-6726567fd597" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_57633bcb-99ff-416a-9054-8284383fde47" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_57633bcb-99ff-416a-9054-8284383fde47" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_72e75055-7d2d-4f32-aec0-b87dde1ad4ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_32c81ad1-6cb1-4e80-b4b7-6d5c47605602" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_72e75055-7d2d-4f32-aec0-b87dde1ad4ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_6cac14a4-0256-40ee-9370-30ad5686362a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_72e75055-7d2d-4f32-aec0-b87dde1ad4ad" xlink:to="loc_us-gaap_AwardTypeAxis_6cac14a4-0256-40ee-9370-30ad5686362a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6cac14a4-0256-40ee-9370-30ad5686362a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_6cac14a4-0256-40ee-9370-30ad5686362a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6cac14a4-0256-40ee-9370-30ad5686362a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9e7fa596-1de4-49b9-8106-f2b027efc202" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_6cac14a4-0256-40ee-9370-30ad5686362a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9e7fa596-1de4-49b9-8106-f2b027efc202" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_4654df27-1b80-4f98-978c-0aaa433da727" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9e7fa596-1de4-49b9-8106-f2b027efc202" xlink:to="loc_us-gaap_RestrictedStockMember_4654df27-1b80-4f98-978c-0aaa433da727" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_b7e56a9a-3a1c-43f9-bdf6-a690edd57cc7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9e7fa596-1de4-49b9-8106-f2b027efc202" xlink:to="loc_us-gaap_StockCompensationPlanMember_b7e56a9a-3a1c-43f9-bdf6-a690edd57cc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_232383bd-e4ba-497d-bf4b-2bb732455d15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9e7fa596-1de4-49b9-8106-f2b027efc202" xlink:to="loc_us-gaap_EmployeeStockOptionMember_232383bd-e4ba-497d-bf4b-2bb732455d15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_c395109f-57fd-4cf7-b2b4-60c9a705edf9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9e7fa596-1de4-49b9-8106-f2b027efc202" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_c395109f-57fd-4cf7-b2b4-60c9a705edf9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_22ee2ac4-0ff4-4c77-b132-254cce530e1a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_72e75055-7d2d-4f32-aec0-b87dde1ad4ad" xlink:to="loc_us-gaap_PlanNameAxis_22ee2ac4-0ff4-4c77-b132-254cce530e1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_22ee2ac4-0ff4-4c77-b132-254cce530e1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_22ee2ac4-0ff4-4c77-b132-254cce530e1a" xlink:to="loc_us-gaap_PlanNameDomain_22ee2ac4-0ff4-4c77-b132-254cce530e1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_25f0b5e2-1064-444e-8ac9-3da098a85c3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_22ee2ac4-0ff4-4c77-b132-254cce530e1a" xlink:to="loc_us-gaap_PlanNameDomain_25f0b5e2-1064-444e-8ac9-3da098a85c3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PerformanceIncentivePlan2020Member_b91f2549-0ff0-4742-98d1-75860bbc98aa" xlink:href="frt-20221231.xsd#frt_PerformanceIncentivePlan2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_25f0b5e2-1064-444e-8ac9-3da098a85c3a" xlink:to="loc_frt_PerformanceIncentivePlan2020Member_b91f2549-0ff0-4742-98d1-75860bbc98aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PerformanceIncentivePlan2010Member_6395a6d6-3df2-4b78-9409-ff44ea7d9dba" xlink:href="frt-20221231.xsd#frt_PerformanceIncentivePlan2010Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_25f0b5e2-1064-444e-8ac9-3da098a85c3a" xlink:to="loc_frt_PerformanceIncentivePlan2010Member_6395a6d6-3df2-4b78-9409-ff44ea7d9dba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_007a6e2f-8b55-4ab0-8e69-3e70b7654bdc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_72e75055-7d2d-4f32-aec0-b87dde1ad4ad" xlink:to="loc_srt_RangeAxis_007a6e2f-8b55-4ab0-8e69-3e70b7654bdc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_007a6e2f-8b55-4ab0-8e69-3e70b7654bdc_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_007a6e2f-8b55-4ab0-8e69-3e70b7654bdc" xlink:to="loc_srt_RangeMember_007a6e2f-8b55-4ab0-8e69-3e70b7654bdc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4bbf7eaf-645a-4e7c-8e0e-69ac34a7a86d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_007a6e2f-8b55-4ab0-8e69-3e70b7654bdc" xlink:to="loc_srt_RangeMember_4bbf7eaf-645a-4e7c-8e0e-69ac34a7a86d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9e5f5ef5-7910-456e-9f98-eb996220f798" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4bbf7eaf-645a-4e7c-8e0e-69ac34a7a86d" xlink:to="loc_srt_MinimumMember_9e5f5ef5-7910-456e-9f98-eb996220f798" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_74bc191c-3d9e-4bb6-b39c-5744f021491e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4bbf7eaf-645a-4e7c-8e0e-69ac34a7a86d" xlink:to="loc_srt_MaximumMember_74bc191c-3d9e-4bb6-b39c-5744f021491e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_78c4e3a6-2663-42ff-b1a5-4d0e524b6fb5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_72e75055-7d2d-4f32-aec0-b87dde1ad4ad" xlink:to="loc_srt_TitleOfIndividualAxis_78c4e3a6-2663-42ff-b1a5-4d0e524b6fb5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_78c4e3a6-2663-42ff-b1a5-4d0e524b6fb5_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_78c4e3a6-2663-42ff-b1a5-4d0e524b6fb5" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_78c4e3a6-2663-42ff-b1a5-4d0e524b6fb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_484e5688-26ed-4323-8a8c-b3f1b94378de" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_78c4e3a6-2663-42ff-b1a5-4d0e524b6fb5" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_484e5688-26ed-4323-8a8c-b3f1b94378de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OfficerMember_3e05c890-f1f3-42ac-99e3-83fd1747bd10" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_484e5688-26ed-4323-8a8c-b3f1b94378de" xlink:to="loc_srt_OfficerMember_3e05c890-f1f3-42ac-99e3-83fd1747bd10" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SavingsandRetirementPlansDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SavingsandRetirementPlansDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SavingsandRetirementPlansDetails" xlink:type="extended" id="i346505383f584eb5beb17e21bafe4a1a_SavingsandRetirementPlansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_19175ac6-e513-4137-82d0-24e4cb2c18bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount_ff279e03-d59d-4423-a58b-30193fa1745a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_19175ac6-e513-4137-82d0-24e4cb2c18bc" xlink:to="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount_ff279e03-d59d-4423-a58b-30193fa1745a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DeferredCompensationArrangementWithIndividualEmployerContributionPerEmployeeMatchingPercent_b4f60e27-7583-4329-b315-edaa161f0b05" xlink:href="frt-20221231.xsd#frt_DeferredCompensationArrangementWithIndividualEmployerContributionPerEmployeeMatchingPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_19175ac6-e513-4137-82d0-24e4cb2c18bc" xlink:to="loc_frt_DeferredCompensationArrangementWithIndividualEmployerContributionPerEmployeeMatchingPercent_b4f60e27-7583-4329-b315-edaa161f0b05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_ddb486b4-2ca3-444e-a99c-72a108dee3cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_19175ac6-e513-4137-82d0-24e4cb2c18bc" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_ddb486b4-2ca3-444e-a99c-72a108dee3cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_441323b3-8f68-495b-acde-318c925525b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_19175ac6-e513-4137-82d0-24e4cb2c18bc" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer_441323b3-8f68-495b-acde-318c925525b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_53a23eac-9844-4686-b2f2-b3be67eb8cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_19175ac6-e513-4137-82d0-24e4cb2c18bc" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability_53a23eac-9844-4686-b2f2-b3be67eb8cf6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_fbd6fb5c-7bae-4d6a-8c3c-23155c6250b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems_19175ac6-e513-4137-82d0-24e4cb2c18bc" xlink:to="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_fbd6fb5c-7bae-4d6a-8c3c-23155c6250b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_521a4fa4-5004-46e3-ba62-dc5a98cbafaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_fbd6fb5c-7bae-4d6a-8c3c-23155c6250b2" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_521a4fa4-5004-46e3-ba62-dc5a98cbafaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_521a4fa4-5004-46e3-ba62-dc5a98cbafaa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_521a4fa4-5004-46e3-ba62-dc5a98cbafaa" xlink:to="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_521a4fa4-5004-46e3-ba62-dc5a98cbafaa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_70f7a905-c9d3-4bd0-9132-6fd3ca05b0ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis_521a4fa4-5004-46e3-ba62-dc5a98cbafaa" xlink:to="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_70f7a905-c9d3-4bd0-9132-6fd3ca05b0ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualByTypeOfCompensationPensionAndOtherPostretirementBenefitsMember_b5f7dc64-f0c6-48dd-ac10-3e5b48a3b54d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCompensationArrangementWithIndividualByTypeOfCompensationPensionAndOtherPostretirementBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherPostretirementBenefitsIndividualContractsTypeOfDeferredCompensationDomain_70f7a905-c9d3-4bd0-9132-6fd3ca05b0ea" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualByTypeOfCompensationPensionAndOtherPostretirementBenefitsMember_b5f7dc64-f0c6-48dd-ac10-3e5b48a3b54d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_18b93015-0d8a-4ce3-bb89-101741468b84" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable_fbd6fb5c-7bae-4d6a-8c3c-23155c6250b2" xlink:to="loc_srt_RangeAxis_18b93015-0d8a-4ce3-bb89-101741468b84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_18b93015-0d8a-4ce3-bb89-101741468b84_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_18b93015-0d8a-4ce3-bb89-101741468b84" xlink:to="loc_srt_RangeMember_18b93015-0d8a-4ce3-bb89-101741468b84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d0695dc6-1583-41e0-b14e-9fd40e1f9d4b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_18b93015-0d8a-4ce3-bb89-101741468b84" xlink:to="loc_srt_RangeMember_d0695dc6-1583-41e0-b14e-9fd40e1f9d4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9986dd67-aa98-43cf-bd0f-039c678ccac7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d0695dc6-1583-41e0-b14e-9fd40e1f9d4b" xlink:to="loc_srt_MaximumMember_9986dd67-aa98-43cf-bd0f-039c678ccac7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/EarningsPerShareDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#EarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/EarningsPerShareDetails" xlink:type="extended" id="i5b2c1525ecde4433a62eaaa94c114302_EarningsPerShareDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights_eef09e8b-9281-488f-bfc8-3dcc266ac246" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights_eef09e8b-9281-488f-bfc8-3dcc266ac246" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_IncrementalCommonUnitsAttributableToParticipatingNonvestedShares_5c19e331-8470-413b-bfd6-356fadf41790" xlink:href="frt-20221231.xsd#frt_IncrementalCommonUnitsAttributableToParticipatingNonvestedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:to="loc_frt_IncrementalCommonUnitsAttributableToParticipatingNonvestedShares_5c19e331-8470-413b-bfd6-356fadf41790" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_071374fa-88c5-4b4a-b9ca-569905a286b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_071374fa-88c5-4b4a-b9ca-569905a286b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitUnits_564f4f3a-ae23-48dc-a58d-6d68b5112183" xlink:href="frt-20221231.xsd#frt_AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:to="loc_frt_AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitUnits_564f4f3a-ae23-48dc-a58d-6d68b5112183" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_70c9b9a7-e450-4ebe-8c2a-02172be581f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_70c9b9a7-e450-4ebe-8c2a-02172be581f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PreferredUnitDistributionRatePercentage_7d74e720-5be3-4d70-aaed-9c3a856422aa" xlink:href="frt-20221231.xsd#frt_PreferredUnitDistributionRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:to="loc_frt_PreferredUnitDistributionRatePercentage_7d74e720-5be3-4d70-aaed-9c3a856422aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EarningsPerShareNarrativeTable_e2e01b94-4a07-42db-9f84-34703956de49" xlink:href="frt-20221231.xsd#frt_EarningsPerShareNarrativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_13bc623b-9774-47b8-9902-c8c1fee6d748" xlink:to="loc_frt_EarningsPerShareNarrativeTable_e2e01b94-4a07-42db-9f84-34703956de49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShareTypeAxis_3d10857c-cf36-4d2c-a720-3bb2b6bc8ac0" xlink:href="frt-20221231.xsd#frt_ShareTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_EarningsPerShareNarrativeTable_e2e01b94-4a07-42db-9f84-34703956de49" xlink:to="loc_frt_ShareTypeAxis_3d10857c-cf36-4d2c-a720-3bb2b6bc8ac0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShareTypeDomain_3d10857c-cf36-4d2c-a720-3bb2b6bc8ac0_default" xlink:href="frt-20221231.xsd#frt_ShareTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_ShareTypeAxis_3d10857c-cf36-4d2c-a720-3bb2b6bc8ac0" xlink:to="loc_frt_ShareTypeDomain_3d10857c-cf36-4d2c-a720-3bb2b6bc8ac0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShareTypeDomain_bffd5421-01ca-4013-8594-ea24edbe5d3a" xlink:href="frt-20221231.xsd#frt_ShareTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_ShareTypeAxis_3d10857c-cf36-4d2c-a720-3bb2b6bc8ac0" xlink:to="loc_frt_ShareTypeDomain_bffd5421-01ca-4013-8594-ea24edbe5d3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_StockOptionsMember_0ab652fc-97e3-481f-8469-4aa375efe7e9" xlink:href="frt-20221231.xsd#frt_StockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ShareTypeDomain_bffd5421-01ca-4013-8594-ea24edbe5d3a" xlink:to="loc_frt_StockOptionsMember_0ab652fc-97e3-481f-8469-4aa375efe7e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ForwardSalesContractsMember_7b32d231-c135-4a93-b83a-bac0b784ac75" xlink:href="frt-20221231.xsd#frt_ForwardSalesContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ShareTypeDomain_bffd5421-01ca-4013-8594-ea24edbe5d3a" xlink:to="loc_frt_ForwardSalesContractsMember_7b32d231-c135-4a93-b83a-bac0b784ac75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PerformanceBasedUnvestedSharesMember_89aea24a-8885-41a1-b853-3a50ce3d13fa" xlink:href="frt-20221231.xsd#frt_PerformanceBasedUnvestedSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_ShareTypeDomain_bffd5421-01ca-4013-8594-ea24edbe5d3a" xlink:to="loc_frt_PerformanceBasedUnvestedSharesMember_89aea24a-8885-41a1-b853-3a50ce3d13fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_2ebb2d4f-5897-49ad-9cc9-b814bfbfa96d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_EarningsPerShareNarrativeTable_e2e01b94-4a07-42db-9f84-34703956de49" xlink:to="loc_us-gaap_StatementClassOfStockAxis_2ebb2d4f-5897-49ad-9cc9-b814bfbfa96d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_2ebb2d4f-5897-49ad-9cc9-b814bfbfa96d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2ebb2d4f-5897-49ad-9cc9-b814bfbfa96d" xlink:to="loc_us-gaap_ClassOfStockDomain_2ebb2d4f-5897-49ad-9cc9-b814bfbfa96d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_4030321f-2e66-407e-ad60-83de863524ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2ebb2d4f-5897-49ad-9cc9-b814bfbfa96d" xlink:to="loc_us-gaap_ClassOfStockDomain_4030321f-2e66-407e-ad60-83de863524ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_7069ddf7-c628-4569-9edc-1160880d68f1" xlink:href="frt-20221231.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_4030321f-2e66-407e-ad60-83de863524ba" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_7069ddf7-c628-4569-9edc-1160880d68f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PreferredUnitsMember_5a853748-e9c3-4c1c-aed4-e22b1d62f0f0" xlink:href="frt-20221231.xsd#frt_PreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_4030321f-2e66-407e-ad60-83de863524ba" xlink:to="loc_frt_PreferredUnitsMember_5a853748-e9c3-4c1c-aed4-e22b1d62f0f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_6f768723-f1b1-4261-9245-776ab3b181fe" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_EarningsPerShareNarrativeTable_e2e01b94-4a07-42db-9f84-34703956de49" xlink:to="loc_srt_ConsolidatedEntitiesAxis_6f768723-f1b1-4261-9245-776ab3b181fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_6f768723-f1b1-4261-9245-776ab3b181fe_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_6f768723-f1b1-4261-9245-776ab3b181fe" xlink:to="loc_srt_ConsolidatedEntitiesDomain_6f768723-f1b1-4261-9245-776ab3b181fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_7c2d9b85-8d13-4c48-8c71-6aff4ba93d08" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_6f768723-f1b1-4261-9245-776ab3b181fe" xlink:to="loc_srt_ConsolidatedEntitiesDomain_7c2d9b85-8d13-4c48-8c71-6aff4ba93d08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_e9ac532d-0427-4b1a-8265-1e8f94037370" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_7c2d9b85-8d13-4c48-8c71-6aff4ba93d08" xlink:to="loc_srt_PartnershipInterestMember_e9ac532d-0427-4b1a-8265-1e8f94037370" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/EarningsPerShareScheduleOfEarningsPerShareDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#EarningsPerShareScheduleOfEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/EarningsPerShareScheduleOfEarningsPerShareDetails" xlink:type="extended" id="i25f4a08281f84dbf8f6fbf2f05be3823_EarningsPerShareScheduleOfEarningsPerShareDetails">
    <link:loc xlink:type="locator" xlink:label="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:href="frt-20221231.xsd#frt_EarningsPerShareNarrativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_1cb627d1-4fd9-4b36-b76e-c1ce28b65984" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_ProfitLoss_1cb627d1-4fd9-4b36-b76e-c1ce28b65984" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_2db3dafe-5825-480c-aa36-81b4c293d092" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_2db3dafe-5825-480c-aa36-81b4c293d092" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DistributionsDeclaredToPreferredUnitHolders_46266ee9-1621-4ce5-bae5-bcb239eb09d0" xlink:href="frt-20221231.xsd#frt_DistributionsDeclaredToPreferredUnitHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_DistributionsDeclaredToPreferredUnitHolders_46266ee9-1621-4ce5-bae5-bcb239eb09d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_c54f7495-1f5e-48fe-83ab-73b92ad122a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_c54f7495-1f5e-48fe-83ab-73b92ad122a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EarningsAllocatedToUnvestedShares_67bbc3e4-85f1-43ac-bcbd-b25fbeb2c8b8" xlink:href="frt-20221231.xsd#frt_EarningsAllocatedToUnvestedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_EarningsAllocatedToUnvestedShares_67bbc3e4-85f1-43ac-bcbd-b25fbeb2c8b8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EarningsAllocatedToUnvestedUnits_f244756b-a491-4d23-882f-f8b8ab31dc69" xlink:href="frt-20221231.xsd#frt_EarningsAllocatedToUnvestedUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_EarningsAllocatedToUnvestedUnits_f244756b-a491-4d23-882f-f8b8ab31dc69" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NetIncomeAvailableForCommonShareholdersBasic_c52dd550-dd10-4a32-b2f6-1f823485a49b" xlink:href="frt-20221231.xsd#frt_NetIncomeAvailableForCommonShareholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_NetIncomeAvailableForCommonShareholdersBasic_c52dd550-dd10-4a32-b2f6-1f823485a49b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NetIncomeAvailableForCommonUnitHoldersBasic_5e220734-143e-4d7b-a846-e2a6db126258" xlink:href="frt-20221231.xsd#frt_NetIncomeAvailableForCommonUnitHoldersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_NetIncomeAvailableForCommonUnitHoldersBasic_5e220734-143e-4d7b-a846-e2a6db126258" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_IncomeAttributableToDownREITOperatingPartnershipUnits_60742ea5-c5ef-4bad-af25-88c98dfd2865" xlink:href="frt-20221231.xsd#frt_IncomeAttributableToDownREITOperatingPartnershipUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_IncomeAttributableToDownREITOperatingPartnershipUnits_60742ea5-c5ef-4bad-af25-88c98dfd2865" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NetIncomeAvailableForCommonShareholdersDiluted_113451fc-a995-4644-a19f-e5e77fe1593c" xlink:href="frt-20221231.xsd#frt_NetIncomeAvailableForCommonShareholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_NetIncomeAvailableForCommonShareholdersDiluted_113451fc-a995-4644-a19f-e5e77fe1593c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NetIncomeAvailableForCommonUnitHoldersValueDiluted_a8d044f0-99e1-4dbb-a64d-78db1e5c2f60" xlink:href="frt-20221231.xsd#frt_NetIncomeAvailableForCommonUnitHoldersValueDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_NetIncomeAvailableForCommonUnitHoldersValueDiluted_a8d044f0-99e1-4dbb-a64d-78db1e5c2f60" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8d8b1cba-9e4d-4112-a7bb-bf5389f3f22c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8d8b1cba-9e4d-4112-a7bb-bf5389f3f22c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic_5bdd36ea-0665-4f32-8d54-7d0ef1c760f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic_5bdd36ea-0665-4f32-8d54-7d0ef1c760f8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_3bb7c989-f11b-47e9-b3db-86b2de24bab2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_3bb7c989-f11b-47e9-b3db-86b2de24bab2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WeightedAverageNumberDilutedUnitsOutstandingAdjustment_a25c4e53-55d9-4353-8d6c-bceaebea1ff6" xlink:href="frt-20221231.xsd#frt_WeightedAverageNumberDilutedUnitsOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_WeightedAverageNumberDilutedUnitsOutstandingAdjustment_a25c4e53-55d9-4353-8d6c-bceaebea1ff6" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CommonSharesAttributableToDilutiveEffectOfDownREITOperatingPartnershipUnits_e0b6c6da-8e01-457b-bcec-8589fbe62f3e" xlink:href="frt-20221231.xsd#frt_CommonSharesAttributableToDilutiveEffectOfDownREITOperatingPartnershipUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_CommonSharesAttributableToDilutiveEffectOfDownREITOperatingPartnershipUnits_e0b6c6da-8e01-457b-bcec-8589fbe62f3e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_20bc243d-ae89-4c91-9d66-ef9d2bb9226f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_20bc243d-ae89-4c91-9d66-ef9d2bb9226f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WeightedAverageNumberPartnershipUnitsOutstandingDiluted_fe0233db-84bb-44b0-95f0-3a539ddd1cd1" xlink:href="frt-20221231.xsd#frt_WeightedAverageNumberPartnershipUnitsOutstandingDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_WeightedAverageNumberPartnershipUnitsOutstandingDiluted_fe0233db-84bb-44b0-95f0-3a539ddd1cd1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_9c87f377-fe15-4612-b86b-25c79a6e6030" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_9c87f377-fe15-4612-b86b-25c79a6e6030" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_564ed42a-400a-4e7b-bb12-30d26254ba9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_9c87f377-fe15-4612-b86b-25c79a6e6030" xlink:to="loc_us-gaap_EarningsPerShareBasic_564ed42a-400a-4e7b-bb12-30d26254ba9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_009c34f3-2e28-4163-85c1-c24b34a7fe49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_009c34f3-2e28-4163-85c1-c24b34a7fe49" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_27029eb0-d7b4-40a1-acc8-2eda06511e16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_009c34f3-2e28-4163-85c1-c24b34a7fe49" xlink:to="loc_us-gaap_EarningsPerShareDiluted_27029eb0-d7b4-40a1-acc8-2eda06511e16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerUnitAbstract_b33c678e-a11e-4219-9f4c-670c506c0aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerUnitAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_us-gaap_EarningsPerUnitAbstract_b33c678e-a11e-4219-9f4c-670c506c0aa1" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasic_d25aa4b0-325e-45df-a6c5-e7668ec115ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerUnitAbstract_b33c678e-a11e-4219-9f4c-670c506c0aa1" xlink:to="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasic_d25aa4b0-325e-45df-a6c5-e7668ec115ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EARNINGSPERCOMMONUNITDILUTEDAbstract_ef108f47-b9b3-4ec7-8257-6af1897023aa" xlink:href="frt-20221231.xsd#frt_EARNINGSPERCOMMONUNITDILUTEDAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_EARNINGSPERCOMMONUNITDILUTEDAbstract_ef108f47-b9b3-4ec7-8257-6af1897023aa" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitDilutedNetOfTax_68f0c0e4-2e18-40fb-85bb-103c932bc32f" xlink:href="frt-20221231.xsd#frt_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitDilutedNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EARNINGSPERCOMMONUNITDILUTEDAbstract_ef108f47-b9b3-4ec7-8257-6af1897023aa" xlink:to="loc_frt_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitDilutedNetOfTax_68f0c0e4-2e18-40fb-85bb-103c932bc32f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EarningsPerShareNarrativeTable_b845c436-9b39-49ed-a823-de08d4d3bcbc" xlink:href="frt-20221231.xsd#frt_EarningsPerShareNarrativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_9f5928ce-cc67-4793-bf14-80aa10888278" xlink:to="loc_frt_EarningsPerShareNarrativeTable_b845c436-9b39-49ed-a823-de08d4d3bcbc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_6079f500-4bbf-4f8e-8f14-022ac764b02d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_EarningsPerShareNarrativeTable_b845c436-9b39-49ed-a823-de08d4d3bcbc" xlink:to="loc_srt_ConsolidatedEntitiesAxis_6079f500-4bbf-4f8e-8f14-022ac764b02d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_6079f500-4bbf-4f8e-8f14-022ac764b02d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_6079f500-4bbf-4f8e-8f14-022ac764b02d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_6079f500-4bbf-4f8e-8f14-022ac764b02d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_b874fb9c-9c21-4aa1-9f43-65426a73cfe6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_6079f500-4bbf-4f8e-8f14-022ac764b02d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_b874fb9c-9c21-4aa1-9f43-65426a73cfe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_PartnershipInterestMember_36ee9dff-337c-4d47-90d3-01534004184e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_PartnershipInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_b874fb9c-9c21-4aa1-9f43-65426a73cfe6" xlink:to="loc_srt_PartnershipInterestMember_36ee9dff-337c-4d47-90d3-01534004184e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/SubsequentEventDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#SubsequentEventDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/SubsequentEventDetails" xlink:type="extended" id="ia5c86e1287e04744a6be67e843877c3b_SubsequentEventDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_130bb89d-6126-4acb-8ef7-e14b0833e3de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AreaOfRealEstateProperty_ddcff5b8-ea55-4879-8adc-1c88ac9d057c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AreaOfRealEstateProperty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_130bb89d-6126-4acb-8ef7-e14b0833e3de" xlink:to="loc_us-gaap_AreaOfRealEstateProperty_ddcff5b8-ea55-4879-8adc-1c88ac9d057c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PurchasePriceOfFeeInterestInRealEstate_e9dc858c-d7fd-4eef-a828-b587eb0a6ca0" xlink:href="frt-20221231.xsd#frt_PurchasePriceOfFeeInterestInRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_130bb89d-6126-4acb-8ef7-e14b0833e3de" xlink:to="loc_frt_PurchasePriceOfFeeInterestInRealEstate_e9dc858c-d7fd-4eef-a828-b587eb0a6ca0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_73accfe9-b933-43f2-be7a-fcc8d30c4214" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_130bb89d-6126-4acb-8ef7-e14b0833e3de" xlink:to="loc_us-gaap_SubsequentEventTable_73accfe9-b933-43f2-be7a-fcc8d30c4214" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_0efbd3ba-dee3-4fbb-bf2e-64e0b3cb91db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_73accfe9-b933-43f2-be7a-fcc8d30c4214" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_0efbd3ba-dee3-4fbb-bf2e-64e0b3cb91db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_0efbd3ba-dee3-4fbb-bf2e-64e0b3cb91db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0efbd3ba-dee3-4fbb-bf2e-64e0b3cb91db" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_0efbd3ba-dee3-4fbb-bf2e-64e0b3cb91db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_c6445f7a-9f5e-4030-9464-85aba4acee21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0efbd3ba-dee3-4fbb-bf2e-64e0b3cb91db" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_c6445f7a-9f5e-4030-9464-85aba4acee21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_3be15aed-3556-46d0-9204-efe48ab7bf6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_c6445f7a-9f5e-4030-9464-85aba4acee21" xlink:to="loc_us-gaap_SubsequentEventMember_3be15aed-3556-46d0-9204-efe48ab7bf6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0b25dc64-1b1c-42a7-a23e-4c5b1f260067" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_73accfe9-b933-43f2-be7a-fcc8d30c4214" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0b25dc64-1b1c-42a7-a23e-4c5b1f260067" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0b25dc64-1b1c-42a7-a23e-4c5b1f260067_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0b25dc64-1b1c-42a7-a23e-4c5b1f260067" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_0b25dc64-1b1c-42a7-a23e-4c5b1f260067_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_39773bec-1337-4777-aa18-bfc2af1bb763" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_0b25dc64-1b1c-42a7-a23e-4c5b1f260067" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_39773bec-1337-4777-aa18-bfc2af1bb763" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HuntingtonsquareMember_de541b17-9ef0-4354-a6c4-5f65f13aa024" xlink:href="frt-20221231.xsd#frt_HuntingtonsquareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_39773bec-1337-4777-aa18-bfc2af1bb763" xlink:to="loc_frt_HuntingtonsquareMember_de541b17-9ef0-4354-a6c4-5f65f13aa024" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ScheduleIIISummaryofRealEstateandAccumulatedDepreciationDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#ScheduleIIISummaryofRealEstateandAccumulatedDepreciationDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ScheduleIIISummaryofRealEstateandAccumulatedDepreciationDetails" xlink:type="extended" id="i3a2f9ca846a541ac8122ea8f6d8bd96a_ScheduleIIISummaryofRealEstateandAccumulatedDepreciationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances_ab0225ab-061e-4a7a-b9a6-9377aff47594" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances_ab0225ab-061e-4a7a-b9a6-9377aff47594" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand_a42cbe37-463e-4ccd-a3af-4b36b5253856" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand_a42cbe37-463e-4ccd-a3af-4b36b5253856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements_ca7c6ed5-1412-4a9b-bbaa-739faf568b66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements_ca7c6ed5-1412-4a9b-bbaa-739faf568b66" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts_e199780c-685b-4d48-8627-2ce7314969be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts_e199780c-685b-4d48-8627-2ce7314969be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand_64e1ee88-c425-4f3d-a00f-e612776c92de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand_64e1ee88-c425-4f3d-a00f-e612776c92de" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements_54cd4ae8-f292-4993-977a-6183fa24d169" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements_54cd4ae8-f292-4993-977a-6183fa24d169" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateGrossAtCarryingValue_4e8ff465-01b3-4b1c-8be8-ac7c806de673" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateGrossAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateGrossAtCarryingValue_4e8ff465-01b3-4b1c-8be8-ac7c806de673" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAccumulatedDepreciation_cf8439d9-6e38-4063-b65a-f8342415a3c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateAccumulatedDepreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateAccumulatedDepreciation_cf8439d9-6e38-4063-b65a-f8342415a3c4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationLifeUsedForDepreciation1_999cf011-cf2f-4c23-ae56-d00217007b72" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealEstateAndAccumulatedDepreciationLifeUsedForDepreciation1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationLifeUsedForDepreciation1_999cf011-cf2f-4c23-ae56-d00217007b72" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationByPropertyTable_7f27460b-94e6-491e-a5b7-293359cfbbc5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationByPropertyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationLineItems_8ad6c654-39cb-4dae-8df9-a01c040d9804" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationByPropertyTable_7f27460b-94e6-491e-a5b7-293359cfbbc5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_8bd71932-d616-4290-bf73-35241c66e07d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationByPropertyTable_7f27460b-94e6-491e-a5b7-293359cfbbc5" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_8bd71932-d616-4290-bf73-35241c66e07d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_8bd71932-d616-4290-bf73-35241c66e07d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_8bd71932-d616-4290-bf73-35241c66e07d" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_8bd71932-d616-4290-bf73-35241c66e07d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_8bd71932-d616-4290-bf73-35241c66e07d" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_A29thPlaceMember_75f7aba4-fbf3-4ee7-809e-b6607118693b" xlink:href="frt-20221231.xsd#frt_A29thPlaceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_A29thPlaceMember_75f7aba4-fbf3-4ee7-809e-b6607118693b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AndorraShoppingCenterMember_0e7c2ef1-e7bf-4d05-96f3-98b60a12fedc" xlink:href="frt-20221231.xsd#frt_AndorraShoppingCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_AndorraShoppingCenterMember_0e7c2ef1-e7bf-4d05-96f3-98b60a12fedc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AssemblySquareMarketPlaceAssemblyRowMember_50eae8cf-465e-44d1-8ea6-533e17082ac4" xlink:href="frt-20221231.xsd#frt_AssemblySquareMarketPlaceAssemblyRowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_AssemblySquareMarketPlaceAssemblyRowMember_50eae8cf-465e-44d1-8ea6-533e17082ac4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AzaleaMember_38b036cf-e55c-4403-a203-692e137abc14" xlink:href="frt-20221231.xsd#frt_AzaleaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_AzaleaMember_38b036cf-e55c-4403-a203-692e137abc14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BalaCynwydMember_2ecee42a-3415-4fa9-babd-33f2b32ef062" xlink:href="frt-20221231.xsd#frt_BalaCynwydMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_BalaCynwydMember_2ecee42a-3415-4fa9-babd-33f2b32ef062" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BarcroftPlazaMember_de88a6b1-18bf-41d6-b992-b96b44d78b0e" xlink:href="frt-20221231.xsd#frt_BarcroftPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_BarcroftPlazaMember_de88a6b1-18bf-41d6-b992-b96b44d78b0e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BarracksRoadMember_7263943f-9d41-4d7c-9d77-f1c36353c340" xlink:href="frt-20221231.xsd#frt_BarracksRoadMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_BarracksRoadMember_7263943f-9d41-4d7c-9d77-f1c36353c340" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BellGardensMember_df2b8be4-4c4f-4e54-ac0b-0ab73995b5b6" xlink:href="frt-20221231.xsd#frt_BellGardensMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_BellGardensMember_df2b8be4-4c4f-4e54-ac0b-0ab73995b5b6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BethesdaRowMember_8bda3296-afd0-46f1-9372-ff59a8e2da80" xlink:href="frt-20221231.xsd#frt_BethesdaRowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_BethesdaRowMember_8bda3296-afd0-46f1-9372-ff59a8e2da80" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FallsPlazaMember_17241825-47ca-47f5-aa32-24b61ae3400d" xlink:href="frt-20221231.xsd#frt_FallsPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FallsPlazaMember_17241825-47ca-47f5-aa32-24b61ae3400d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BrickPlazaMember_f3985d0f-9b90-4299-b2fb-8238b562862e" xlink:href="frt-20221231.xsd#frt_BrickPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_BrickPlazaMember_f3985d0f-9b90-4299-b2fb-8238b562862e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_BristolMember_9bc641dc-1fb4-4dff-9a18-43ad001251bf" xlink:href="frt-20221231.xsd#frt_BristolMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_BristolMember_9bc641dc-1fb4-4dff-9a18-43ad001251bf" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Brook35Member_40c6c658-b7f8-4d20-be3c-db165206ea2a" xlink:href="frt-20221231.xsd#frt_Brook35Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_Brook35Member_40c6c658-b7f8-4d20-be3c-db165206ea2a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CamelbackColonnadeMember_975eb196-da2a-4fe5-8069-e722c57bd8a0" xlink:href="frt-20221231.xsd#frt_CamelbackColonnadeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_CamelbackColonnadeMember_975eb196-da2a-4fe5-8069-e722c57bd8a0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CampusPlazaMember_842d43f6-75ea-46c7-9fe4-36453bd71372" xlink:href="frt-20221231.xsd#frt_CampusPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_CampusPlazaMember_842d43f6-75ea-46c7-9fe4-36453bd71372" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChelseaMember_4ce28c20-50a9-4a38-8a56-8f93f80cf146" xlink:href="frt-20221231.xsd#frt_ChelseaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ChelseaMember_4ce28c20-50a9-4a38-8a56-8f93f80cf146" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ChesterbrookMember_3c461cd5-dc41-41a1-a104-f05b5d5cd8e7" xlink:href="frt-20221231.xsd#frt_ChesterbrookMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ChesterbrookMember_3c461cd5-dc41-41a1-a104-f05b5d5cd8e7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CocoWalkMember_b963743f-02b8-493e-a621-d027963c331c" xlink:href="frt-20221231.xsd#frt_CocoWalkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_CocoWalkMember_b963743f-02b8-493e-a621-d027963c331c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ColoradoBlvdMember_f9f6b75b-c60c-42c9-83a4-d5a8b8b2e744" xlink:href="frt-20221231.xsd#frt_ColoradoBlvdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ColoradoBlvdMember_f9f6b75b-c60c-42c9-83a4-d5a8b8b2e744" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CongressionalPlazaMember_c4641eb3-ed9b-4d84-bf1e-ece728a58b09" xlink:href="frt-20221231.xsd#frt_CongressionalPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_CongressionalPlazaMember_c4641eb3-ed9b-4d84-bf1e-ece728a58b09" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CourthouseCenterMember_8b488106-90e4-4558-ba17-1b4a07ba92c1" xlink:href="frt-20221231.xsd#frt_CourthouseCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_CourthouseCenterMember_8b488106-90e4-4558-ba17-1b4a07ba92c1" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CrossroadsMember_006005b9-e686-4444-9843-40dba50b151c" xlink:href="frt-20221231.xsd#frt_CrossroadsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_CrossroadsMember_006005b9-e686-4444-9843-40dba50b151c" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_CrowCanyonMember_30370d04-d59b-4b84-8f1a-40a5f00b5f7c" xlink:href="frt-20221231.xsd#frt_CrowCanyonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_CrowCanyonMember_30370d04-d59b-4b84-8f1a-40a5f00b5f7c" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DarienMember_c7c15f6c-cdd5-4242-8153-6d857a81ee3e" xlink:href="frt-20221231.xsd#frt_DarienMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_DarienMember_c7c15f6c-cdd5-4242-8153-6d857a81ee3e" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DedhamPlazaMember_0907cae9-5f54-4d1f-8d53-c965eee5efc6" xlink:href="frt-20221231.xsd#frt_DedhamPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_DedhamPlazaMember_0907cae9-5f54-4d1f-8d53-c965eee5efc6" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_DelMarVillageMember_b9856f16-c940-46e3-8fa0-92b29c696e97" xlink:href="frt-20221231.xsd#frt_DelMarVillageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_DelMarVillageMember_b9856f16-c940-46e3-8fa0-92b29c696e97" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EastBayBridgeMember_5f43773a-3da4-48df-a193-aa2dd87e1040" xlink:href="frt-20221231.xsd#frt_EastBayBridgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_EastBayBridgeMember_5f43773a-3da4-48df-a193-aa2dd87e1040" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ElllisburgCircleMember_c185737d-4918-49c9-82e0-0bfb7dc99e6b" xlink:href="frt-20221231.xsd#frt_ElllisburgCircleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ElllisburgCircleMember_c185737d-4918-49c9-82e0-0bfb7dc99e6b" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_EscondidoPromenadeMember_69c3022f-0d11-4fca-af16-2ee3138f9c4f" xlink:href="frt-20221231.xsd#frt_EscondidoPromenadeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_EscondidoPromenadeMember_69c3022f-0d11-4fca-af16-2ee3138f9c4f" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FairfaxJunctionMember_5604a03e-f183-4b1f-be16-bb96e0f24577" xlink:href="frt-20221231.xsd#frt_FairfaxJunctionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FairfaxJunctionMember_5604a03e-f183-4b1f-be16-bb96e0f24577" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FederalPlazaMember_961dc8a8-35f7-460e-9a47-f5904be6d968" xlink:href="frt-20221231.xsd#frt_FederalPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FederalPlazaMember_961dc8a8-35f7-460e-9a47-f5904be6d968" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FinleySquareMember_25075053-8647-4da5-b9ff-67b8d699d233" xlink:href="frt-20221231.xsd#frt_FinleySquareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FinleySquareMember_25075053-8647-4da5-b9ff-67b8d699d233" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FlourtownMember_421651a6-0e84-41cb-b9a5-3a8fe175e4a9" xlink:href="frt-20221231.xsd#frt_FlourtownMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FlourtownMember_421651a6-0e84-41cb-b9a5-3a8fe175e4a9" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FourthStreetMember_9358e543-9639-4553-865a-56dce50678e9" xlink:href="frt-20221231.xsd#frt_FourthStreetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FourthStreetMember_9358e543-9639-4553-865a-56dce50678e9" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_JordanDownsPlazaMember_992bfd69-9e0f-48db-a908-f72ae1d009af" xlink:href="frt-20221231.xsd#frt_JordanDownsPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_JordanDownsPlazaMember_992bfd69-9e0f-48db-a908-f72ae1d009af" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FreshMeadowsMember_ce49492a-870d-473c-9c33-89b9ddebcc12" xlink:href="frt-20221231.xsd#frt_FreshMeadowsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FreshMeadowsMember_ce49492a-870d-473c-9c33-89b9ddebcc12" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_FriendshipCtrMember_df7abcec-8b45-4dbe-a1fa-a17e5e464a38" xlink:href="frt-20221231.xsd#frt_FriendshipCtrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_FriendshipCtrMember_df7abcec-8b45-4dbe-a1fa-a17e5e464a38" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GaithersburgSquareMember_d8cd5297-d3c2-4cf7-a904-ac2b0ab80e58" xlink:href="frt-20221231.xsd#frt_GaithersburgSquareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GaithersburgSquareMember_d8cd5297-d3c2-4cf7-a904-ac2b0ab80e58" xlink:type="arc" order="37"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GardenMarketMember_45b73e5f-5b90-4e39-8feb-c9462a85700d" xlink:href="frt-20221231.xsd#frt_GardenMarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GardenMarketMember_45b73e5f-5b90-4e39-8feb-c9462a85700d" xlink:type="arc" order="38"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GeorgetowneShoppingCenterMember_a1288c38-1bd4-4b01-bd2a-3ee5671a00a4" xlink:href="frt-20221231.xsd#frt_GeorgetowneShoppingCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GeorgetowneShoppingCenterMember_a1288c38-1bd4-4b01-bd2a-3ee5671a00a4" xlink:type="arc" order="39"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GovernorPlazaMember_d0f23f93-7f13-4241-b2ba-83c0dc062f75" xlink:href="frt-20221231.xsd#frt_GovernorPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GovernorPlazaMember_d0f23f93-7f13-4241-b2ba-83c0dc062f75" xlink:type="arc" order="40"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GrahamParkMember_fd58e59c-7732-4659-bc5f-ebcb293f7da5" xlink:href="frt-20221231.xsd#frt_GrahamParkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GrahamParkMember_fd58e59c-7732-4659-bc5f-ebcb293f7da5" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GratiotPlazaMember_b62462a8-a5ae-4492-8dd8-c5d4884e8f38" xlink:href="frt-20221231.xsd#frt_GratiotPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GratiotPlazaMember_b62462a8-a5ae-4492-8dd8-c5d4884e8f38" xlink:type="arc" order="42"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GreenlawnPlazaMember_41de5210-10e0-412b-b5b8-95e2471e28a0" xlink:href="frt-20221231.xsd#frt_GreenlawnPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GreenlawnPlazaMember_41de5210-10e0-412b-b5b8-95e2471e28a0" xlink:type="arc" order="43"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GreenwichAvenueMember_c5f66c6a-a417-4e80-a82d-0f1f4f59d0d6" xlink:href="frt-20221231.xsd#frt_GreenwichAvenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GreenwichAvenueMember_c5f66c6a-a417-4e80-a82d-0f1f4f59d0d6" xlink:type="arc" order="44"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_GrossmontCenterMember_eb3260f1-c83d-45ca-8220-a2694a73bd43" xlink:href="frt-20221231.xsd#frt_GrossmontCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_GrossmontCenterMember_eb3260f1-c83d-45ca-8220-a2694a73bd43" xlink:type="arc" order="45"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HastingsRanchPlazaMember_dd01d74f-de98-40a8-b1c1-8f3d737659e5" xlink:href="frt-20221231.xsd#frt_HastingsRanchPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_HastingsRanchPlazaMember_dd01d74f-de98-40a8-b1c1-8f3d737659e5" xlink:type="arc" order="46"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HauppaugeMember_f73cdc79-46b8-4150-88de-feb3a53d9a1b" xlink:href="frt-20221231.xsd#frt_HauppaugeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_HauppaugeMember_f73cdc79-46b8-4150-88de-feb3a53d9a1b" xlink:type="arc" order="47"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HiltonVillageMember_595860f5-9f01-4246-8743-42e1a9b31319" xlink:href="frt-20221231.xsd#frt_HiltonVillageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_HiltonVillageMember_595860f5-9f01-4246-8743-42e1a9b31319" xlink:type="arc" order="48"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HobokenMember_4e29fb85-55c1-4469-a7c3-12d975a06d4f" xlink:href="frt-20221231.xsd#frt_HobokenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_HobokenMember_4e29fb85-55c1-4469-a7c3-12d975a06d4f" xlink:type="arc" order="49"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HollywoodBlvdMember_eb6bd124-ae1b-4f7e-a71e-4a381d2eb16d" xlink:href="frt-20221231.xsd#frt_HollywoodBlvdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_HollywoodBlvdMember_eb6bd124-ae1b-4f7e-a71e-4a381d2eb16d" xlink:type="arc" order="50"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HuntingtonMember_34a37a91-aa10-4e2c-936a-bacc2a29ba7d" xlink:href="frt-20221231.xsd#frt_HuntingtonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_HuntingtonMember_34a37a91-aa10-4e2c-936a-bacc2a29ba7d" xlink:type="arc" order="51"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_HuntingtonsquareMember_c8958c70-b82a-4288-aa1f-719b7a08b879" xlink:href="frt-20221231.xsd#frt_HuntingtonsquareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_HuntingtonsquareMember_c8958c70-b82a-4288-aa1f-719b7a08b879" xlink:type="arc" order="52"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_IdylwoodPlazaMember_e8094ed6-baa6-4c5d-91ba-c4ca369cc65b" xlink:href="frt-20221231.xsd#frt_IdylwoodPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_IdylwoodPlazaMember_e8094ed6-baa6-4c5d-91ba-c4ca369cc65b" xlink:type="arc" order="53"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_KingsCourtMember_93337d8a-97ad-40c3-9ff7-2fd134089231" xlink:href="frt-20221231.xsd#frt_KingsCourtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_KingsCourtMember_93337d8a-97ad-40c3-9ff7-2fd134089231" xlink:type="arc" order="54"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_KingstowneShoppingCenterMember_c2b6c909-6dd9-45e1-a8c5-bcf9b1bb47f1" xlink:href="frt-20221231.xsd#frt_KingstowneShoppingCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_KingstowneShoppingCenterMember_c2b6c909-6dd9-45e1-a8c5-bcf9b1bb47f1" xlink:type="arc" order="55"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LancasterMember_277ba186-7f7c-42fc-a161-c756fb58a4c5" xlink:href="frt-20221231.xsd#frt_LancasterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_LancasterMember_277ba186-7f7c-42fc-a161-c756fb58a4c5" xlink:type="arc" order="56"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LanghorneSquareMember_e6591f44-7cbd-4356-b6d4-691b70c5ce06" xlink:href="frt-20221231.xsd#frt_LanghorneSquareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_LanghorneSquareMember_e6591f44-7cbd-4356-b6d4-691b70c5ce06" xlink:type="arc" order="57"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LaurelMember_3ab0a647-d391-402d-a65f-dbf30f96f8db" xlink:href="frt-20221231.xsd#frt_LaurelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_LaurelMember_3ab0a647-d391-402d-a65f-dbf30f96f8db" xlink:type="arc" order="58"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LawrenceParkMember_bb3d547d-e655-4b05-8c66-1832d2bbfc37" xlink:href="frt-20221231.xsd#frt_LawrenceParkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_LawrenceParkMember_bb3d547d-e655-4b05-8c66-1832d2bbfc37" xlink:type="arc" order="59"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_LindenSquareMember_e4d46ea1-80f5-446a-94f6-4b2d58317698" xlink:href="frt-20221231.xsd#frt_LindenSquareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_LindenSquareMember_e4d46ea1-80f5-446a-94f6-4b2d58317698" xlink:type="arc" order="60"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MelvilleMallMember_0a974720-086a-4e71-af19-b6aae492c3f9" xlink:href="frt-20221231.xsd#frt_MelvilleMallMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_MelvilleMallMember_0a974720-086a-4e71-af19-b6aae492c3f9" xlink:type="arc" order="61"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MercerMallMember_d8a464c8-bc7c-4b17-aaa9-5b2733de3347" xlink:href="frt-20221231.xsd#frt_MercerMallMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_MercerMallMember_d8a464c8-bc7c-4b17-aaa9-5b2733de3347" xlink:type="arc" order="62"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MontroseCrossingMember_c52fce2d-56c9-425c-b3e6-5c64c6a6aeec" xlink:href="frt-20221231.xsd#frt_MontroseCrossingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_MontroseCrossingMember_c52fce2d-56c9-425c-b3e6-5c64c6a6aeec" xlink:type="arc" order="63"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MountVernonMember_3695582b-5776-4471-976c-c2df72c27092" xlink:href="frt-20221231.xsd#frt_MountVernonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_MountVernonMember_3695582b-5776-4471-976c-c2df72c27092" xlink:type="arc" order="64"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NorthDartmouthMember_8577ce88-4030-4a20-92dc-31ca449f8bf8" xlink:href="frt-20221231.xsd#frt_NorthDartmouthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_NorthDartmouthMember_8577ce88-4030-4a20-92dc-31ca449f8bf8" xlink:type="arc" order="65"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_NortheastMember_d600703c-0bfb-4f15-857c-f7b472d894ec" xlink:href="frt-20221231.xsd#frt_NortheastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_NortheastMember_d600703c-0bfb-4f15-857c-f7b472d894ec" xlink:type="arc" order="66"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OldKeeneMillMember_f24edb8c-e408-402e-918d-8e66eae8d19d" xlink:href="frt-20221231.xsd#frt_OldKeeneMillMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_OldKeeneMillMember_f24edb8c-e408-402e-918d-8e66eae8d19d" xlink:type="arc" order="67"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OldTownCenterMember_ee407519-89ee-4352-ab7c-9c716ef9a08e" xlink:href="frt-20221231.xsd#frt_OldTownCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_OldTownCenterMember_ee407519-89ee-4352-ab7c-9c716ef9a08e" xlink:type="arc" order="68"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_OlivoatMissionHillsMember_b843434e-286d-4fa7-b45e-d72513c6bbde" xlink:href="frt-20221231.xsd#frt_OlivoatMissionHillsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_OlivoatMissionHillsMember_b843434e-286d-4fa7-b45e-d72513c6bbde" xlink:type="arc" order="69"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PanAmShoppingCenterMember_3c706eb4-c64d-485b-94be-78ce219cbbcf" xlink:href="frt-20221231.xsd#frt_PanAmShoppingCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_PanAmShoppingCenterMember_3c706eb4-c64d-485b-94be-78ce219cbbcf" xlink:type="arc" order="70"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PerringPlazaMember_27207025-6724-4ee2-b58f-a9839ada2785" xlink:href="frt-20221231.xsd#frt_PerringPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_PerringPlazaMember_27207025-6724-4ee2-b58f-a9839ada2785" xlink:type="arc" order="71"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PikeRoseMember_f4a22f9a-60ab-4797-962b-5b120ba4712c" xlink:href="frt-20221231.xsd#frt_PikeRoseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_PikeRoseMember_f4a22f9a-60ab-4797-962b-5b120ba4712c" xlink:type="arc" order="72"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_Pike7Member_afba9e98-1cb6-405b-ad03-0a404d491cbf" xlink:href="frt-20221231.xsd#frt_Pike7Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_Pike7Member_afba9e98-1cb6-405b-ad03-0a404d491cbf" xlink:type="arc" order="73"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PlazaDelMercadoMember_458523d2-8fc7-4520-9cc8-d1a74acdd512" xlink:href="frt-20221231.xsd#frt_PlazaDelMercadoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_PlazaDelMercadoMember_458523d2-8fc7-4520-9cc8-d1a74acdd512" xlink:type="arc" order="74"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PlazaDelSolMember_51d3479e-514b-4bd4-b825-3fe475d823cd" xlink:href="frt-20221231.xsd#frt_PlazaDelSolMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_PlazaDelSolMember_51d3479e-514b-4bd4-b825-3fe475d823cd" xlink:type="arc" order="75"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_PlazaElSegundoThePointMember_469eb98d-e927-4a17-a1b9-8abc255ab800" xlink:href="frt-20221231.xsd#frt_PlazaElSegundoThePointMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_PlazaElSegundoThePointMember_469eb98d-e927-4a17-a1b9-8abc255ab800" xlink:type="arc" order="76"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_QueenAnnePlazaMember_2b5b0faf-cb7e-4efa-86ba-ee5f6e2aba84" xlink:href="frt-20221231.xsd#frt_QueenAnnePlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_QueenAnnePlazaMember_2b5b0faf-cb7e-4efa-86ba-ee5f6e2aba84" xlink:type="arc" order="77"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_QuinceOrchardPlazaMember_49f069c2-28d5-47bf-b9a8-b47c18d03c39" xlink:href="frt-20221231.xsd#frt_QuinceOrchardPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_QuinceOrchardPlazaMember_49f069c2-28d5-47bf-b9a8-b47c18d03c39" xlink:type="arc" order="78"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_RiverpointCenterMember_062d08f4-0ef3-43c0-8196-fd906d543435" xlink:href="frt-20221231.xsd#frt_RiverpointCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_RiverpointCenterMember_062d08f4-0ef3-43c0-8196-fd906d543435" xlink:type="arc" order="79"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SanAntonioCenterMember_3bd5c47b-3c1d-4c6f-a344-02dcc9dd5540" xlink:href="frt-20221231.xsd#frt_SanAntonioCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_SanAntonioCenterMember_3bd5c47b-3c1d-4c6f-a344-02dcc9dd5540" xlink:type="arc" order="80"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SantanaRowMember_28102a1c-b971-4fa9-bc7d-a745cf598b83" xlink:href="frt-20221231.xsd#frt_SantanaRowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_SantanaRowMember_28102a1c-b971-4fa9-bc7d-a745cf598b83" xlink:type="arc" order="81"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SylmarTowneCenterMember_284dfc07-df7f-4a7a-a1db-0eb5518a1e55" xlink:href="frt-20221231.xsd#frt_SylmarTowneCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_SylmarTowneCenterMember_284dfc07-df7f-4a7a-a1db-0eb5518a1e55" xlink:type="arc" order="82"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AvenueAtWhiteMarshMember_0e83321e-2b48-46d2-bef5-c0c21bb7b980" xlink:href="frt-20221231.xsd#frt_AvenueAtWhiteMarshMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_AvenueAtWhiteMarshMember_0e83321e-2b48-46d2-bef5-c0c21bb7b980" xlink:type="arc" order="83"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TheGroveatShrewsburyMember_1c2b2381-1131-411e-8b5b-f37666332449" xlink:href="frt-20221231.xsd#frt_TheGroveatShrewsburyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_TheGroveatShrewsburyMember_1c2b2381-1131-411e-8b5b-f37666332449" xlink:type="arc" order="84"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShoppesAtNottinghamSquareMember_22596060-1f93-4ae3-b238-34c9ea560016" xlink:href="frt-20221231.xsd#frt_ShoppesAtNottinghamSquareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ShoppesAtNottinghamSquareMember_22596060-1f93-4ae3-b238-34c9ea560016" xlink:type="arc" order="85"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShopsAtPembrokeGardensMember_efdd5282-9912-420f-9a78-f3103dceeeb8" xlink:href="frt-20221231.xsd#frt_ShopsAtPembrokeGardensMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ShopsAtPembrokeGardensMember_efdd5282-9912-420f-9a78-f3103dceeeb8" xlink:type="arc" order="86"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ThirdStreetPromenadeMember_63aa1a19-8f36-4a1a-a87a-50cdd2e4e668" xlink:href="frt-20221231.xsd#frt_ThirdStreetPromenadeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ThirdStreetPromenadeMember_63aa1a19-8f36-4a1a-a87a-50cdd2e4e668" xlink:type="arc" order="87"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TowerMember_7da8f090-7504-4d73-8c69-78645daaef82" xlink:href="frt-20221231.xsd#frt_TowerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_TowerMember_7da8f090-7504-4d73-8c69-78645daaef82" xlink:type="arc" order="88"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TowerShopsJanuary192011Member_14e8d617-e0f1-419d-a7f2-cea2da5d6c8d" xlink:href="frt-20221231.xsd#frt_TowerShopsJanuary192011Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_TowerShopsJanuary192011Member_14e8d617-e0f1-419d-a7f2-cea2da5d6c8d" xlink:type="arc" order="89"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TownCenterOfNewBritainMember_dd0d6968-1e3e-41f0-bde1-833c698b1641" xlink:href="frt-20221231.xsd#frt_TownCenterOfNewBritainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_TownCenterOfNewBritainMember_dd0d6968-1e3e-41f0-bde1-833c698b1641" xlink:type="arc" order="90"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TroyMember_cfeb1412-5842-43dd-aa87-df199fdd5ac3" xlink:href="frt-20221231.xsd#frt_TroyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_TroyMember_cfeb1412-5842-43dd-aa87-df199fdd5ac3" xlink:type="arc" order="91"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TwinbrookeShoppingCentreMember_a613f386-5f93-4363-bf54-b7732bbc5cf1" xlink:href="frt-20221231.xsd#frt_TwinbrookeShoppingCentreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_TwinbrookeShoppingCentreMember_a613f386-5f93-4363-bf54-b7732bbc5cf1" xlink:type="arc" order="92"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_TysonStationMember_ce39fc42-69e5-4486-b48a-19a57332c968" xlink:href="frt-20221231.xsd#frt_TysonStationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_TysonStationMember_ce39fc42-69e5-4486-b48a-19a57332c968" xlink:type="arc" order="93"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ShirlingtonMember_424f720d-639b-4e24-a152-b8056c531a15" xlink:href="frt-20221231.xsd#frt_ShirlingtonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_ShirlingtonMember_424f720d-639b-4e24-a152-b8056c531a15" xlink:type="arc" order="94"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WestgateMallMember_6fc6e3a0-07f4-4f67-b0b1-2562823720ea" xlink:href="frt-20221231.xsd#frt_WestgateMallMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WestgateMallMember_6fc6e3a0-07f4-4f67-b0b1-2562823720ea" xlink:type="arc" order="95"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WestpostMember_21644491-7e92-4dd8-8970-f2618ffb65d4" xlink:href="frt-20221231.xsd#frt_WestpostMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WestpostMember_21644491-7e92-4dd8-8970-f2618ffb65d4" xlink:type="arc" order="96"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WhiteMarshPlazaMember_e3e56a84-9f24-4077-959a-5de0edd296b0" xlink:href="frt-20221231.xsd#frt_WhiteMarshPlazaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WhiteMarshPlazaMember_e3e56a84-9f24-4077-959a-5de0edd296b0" xlink:type="arc" order="97"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WhiteMarshOtherMember_d41691e7-3e19-4e8e-a7e7-b395ab9f58f0" xlink:href="frt-20221231.xsd#frt_WhiteMarshOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WhiteMarshOtherMember_d41691e7-3e19-4e8e-a7e7-b395ab9f58f0" xlink:type="arc" order="98"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WildwoodMember_8175e75d-4e72-4846-9c01-bd72e422b41e" xlink:href="frt-20221231.xsd#frt_WildwoodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WildwoodMember_8175e75d-4e72-4846-9c01-bd72e422b41e" xlink:type="arc" order="99"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WillowGroveMember_c93d8207-1357-45c6-a351-4f5060518606" xlink:href="frt-20221231.xsd#frt_WillowGroveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WillowGroveMember_c93d8207-1357-45c6-a351-4f5060518606" xlink:type="arc" order="100"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WillowLawnMember_183679f5-236f-4990-930d-317369b13767" xlink:href="frt-20221231.xsd#frt_WillowLawnMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WillowLawnMember_183679f5-236f-4990-930d-317369b13767" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_WynnewoodMember_cc29ee6b-4f6c-4398-baf1-3cd01a0d88a3" xlink:href="frt-20221231.xsd#frt_WynnewoodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_30b1b21e-6bbe-4ebb-9118-6fd0b7b12e93" xlink:to="loc_frt_WynnewoodMember_cc29ee6b-4f6c-4398-baf1-3cd01a0d88a3" xlink:type="arc" order="102"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_36f01a33-2b17-4b22-8573-0298b2bb0aa0" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationByPropertyTable_7f27460b-94e6-491e-a5b7-293359cfbbc5" xlink:to="loc_srt_RangeAxis_36f01a33-2b17-4b22-8573-0298b2bb0aa0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_36f01a33-2b17-4b22-8573-0298b2bb0aa0_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_36f01a33-2b17-4b22-8573-0298b2bb0aa0" xlink:to="loc_srt_RangeMember_36f01a33-2b17-4b22-8573-0298b2bb0aa0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_58a817fc-3ed5-4f22-923b-5210f550e6c9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_36f01a33-2b17-4b22-8573-0298b2bb0aa0" xlink:to="loc_srt_RangeMember_58a817fc-3ed5-4f22-923b-5210f550e6c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_65a93de1-7475-4b24-bd4c-9f618d37410d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_58a817fc-3ed5-4f22-923b-5210f550e6c9" xlink:to="loc_srt_MaximumMember_65a93de1-7475-4b24-bd4c-9f618d37410d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.federalrealty.com/role/ScheduleIVMortgageLoansonRealEstateDetails" xlink:type="simple" xlink:href="frt-20221231.xsd#ScheduleIVMortgageLoansonRealEstateDetails"/>
  <link:definitionLink xlink:role="http://www.federalrealty.com/role/ScheduleIVMortgageLoansonRealEstateDetails" xlink:type="extended" id="i4575110ebcd74e4e9dea4b88f2521dac_ScheduleIVMortgageLoansonRealEstateDetails">
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_MortgageLoansOnRealEstateParticipationPlusInterestRateInterestRate_ba075774-dcf0-4a7a-95b5-c129d753169e" xlink:href="frt-20221231.xsd#frt_MortgageLoansOnRealEstateParticipationPlusInterestRateInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_frt_MortgageLoansOnRealEstateParticipationPlusInterestRateInterestRate_ba075774-dcf0-4a7a-95b5-c129d753169e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstatePriorLiens1_9761207c-f248-42d4-aa68-7b65cd57af55" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstatePriorLiens1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_srt_MortgageLoansOnRealEstatePriorLiens1_9761207c-f248-42d4-aa68-7b65cd57af55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateFaceAmountOfMortgages_eaf3d47a-f676-4349-8f27-905f51701952" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateFaceAmountOfMortgages"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_srt_MortgageLoansOnRealEstateFaceAmountOfMortgages_eaf3d47a-f676-4349-8f27-905f51701952" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstate_6547572d-6316-4c95-ab8d-9acc80df33d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MortgageLoansOnRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_us-gaap_MortgageLoansOnRealEstate_6547572d-6316-4c95-ab8d-9acc80df33d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans_5ab9398c-03d8-4152-ab63-73927ed094ca" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_srt_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans_5ab9398c-03d8-4152-ab63-73927ed094ca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateOtherRequiredDisclosuresAbstract_dc3c47d9-9aab-4066-8b52-c230acb9882f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateOtherRequiredDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_srt_MortgageLoansOnRealEstateOtherRequiredDisclosuresAbstract_dc3c47d9-9aab-4066-8b52-c230acb9882f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateFederalIncomeTaxBasis1_fc3bf39f-4a79-4772-a134-4a478a3deb5f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateFederalIncomeTaxBasis1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateOtherRequiredDisclosuresAbstract_dc3c47d9-9aab-4066-8b52-c230acb9882f" xlink:to="loc_srt_MortgageLoansOnRealEstateFederalIncomeTaxBasis1_fc3bf39f-4a79-4772-a134-4a478a3deb5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInMortgageLoansOnRealEstateRollForward_8e91a179-2ca4-452e-b135-5791ee753276" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MovementInMortgageLoansOnRealEstateRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_us-gaap_MovementInMortgageLoansOnRealEstateRollForward_8e91a179-2ca4-452e-b135-5791ee753276" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstate_85000b76-b2d3-4579-951f-1bd47abd2001" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MortgageLoansOnRealEstate"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_January12020AdoptionOfNewAccountingStandard_62212a70-061d-4db9-b93f-ce98d367d9ff" xlink:href="frt-20221231.xsd#frt_January12020AdoptionOfNewAccountingStandard"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInMortgageLoansOnRealEstateRollForward_8e91a179-2ca4-452e-b135-5791ee753276" xlink:to="loc_frt_January12020AdoptionOfNewAccountingStandard_62212a70-061d-4db9-b93f-ce98d367d9ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_AcquisitionsOfLoansNetOfValuationAdjustements_78fad190-f27e-42ca-9c55-e5701abdf2fa" xlink:href="frt-20221231.xsd#frt_AcquisitionsOfLoansNetOfValuationAdjustements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInMortgageLoansOnRealEstateRollForward_8e91a179-2ca4-452e-b135-5791ee753276" xlink:to="loc_frt_AcquisitionsOfLoansNetOfValuationAdjustements_78fad190-f27e-42ca-9c55-e5701abdf2fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateNewMortgageLoans_1fa78b3a-9705-4193-8e86-83bb0ac491ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MortgageLoansOnRealEstateNewMortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInMortgageLoansOnRealEstateRollForward_8e91a179-2ca4-452e-b135-5791ee753276" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateNewMortgageLoans_1fa78b3a-9705-4193-8e86-83bb0ac491ca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateCollectionsOfPrincipal_5c0212f5-c63d-4f8a-b44b-9322749d60b6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateCollectionsOfPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInMortgageLoansOnRealEstateRollForward_8e91a179-2ca4-452e-b135-5791ee753276" xlink:to="loc_srt_MortgageLoansOnRealEstateCollectionsOfPrincipal_5c0212f5-c63d-4f8a-b44b-9322749d60b6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_ValuationAdjustments_0e53f06f-6552-47a6-bb41-f72216bcacc6" xlink:href="frt-20221231.xsd#frt_ValuationAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInMortgageLoansOnRealEstateRollForward_8e91a179-2ca4-452e-b135-5791ee753276" xlink:to="loc_frt_ValuationAdjustments_0e53f06f-6552-47a6-bb41-f72216bcacc6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstate_624bf5d2-0d40-408c-bcb3-0587aa7f37b6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MortgageLoansOnRealEstate"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateScheduleTable_c6c05307-c2c4-4333-bd7d-6abfc1a9a5fc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateScheduleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_MortgageLoansOnRealEstateLineItems_b1a54f29-6adb-4597-a045-7088f9e03d48" xlink:to="loc_srt_MortgageLoansOnRealEstateScheduleTable_c6c05307-c2c4-4333-bd7d-6abfc1a9a5fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_InterestRateAxis_4502f4d9-d554-41c5-8761-26c36dbc3d70" xlink:href="frt-20221231.xsd#frt_InterestRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_MortgageLoansOnRealEstateScheduleTable_c6c05307-c2c4-4333-bd7d-6abfc1a9a5fc" xlink:to="loc_frt_InterestRateAxis_4502f4d9-d554-41c5-8761-26c36dbc3d70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_InterestRateDomain_4502f4d9-d554-41c5-8761-26c36dbc3d70_default" xlink:href="frt-20221231.xsd#frt_InterestRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_InterestRateAxis_4502f4d9-d554-41c5-8761-26c36dbc3d70" xlink:to="loc_frt_InterestRateDomain_4502f4d9-d554-41c5-8761-26c36dbc3d70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_InterestRateDomain_83a69247-1551-4abc-9ad6-ceb22d726b53" xlink:href="frt-20221231.xsd#frt_InterestRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_InterestRateAxis_4502f4d9-d554-41c5-8761-26c36dbc3d70" xlink:to="loc_frt_InterestRateDomain_83a69247-1551-4abc-9ad6-ceb22d726b53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_InterestRateOneMember_70b01c4c-c788-45b9-b7b6-103a08274f8d" xlink:href="frt-20221231.xsd#frt_InterestRateOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_InterestRateDomain_83a69247-1551-4abc-9ad6-ceb22d726b53" xlink:to="loc_frt_InterestRateOneMember_70b01c4c-c788-45b9-b7b6-103a08274f8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_InterestRateTwoMember_c36451e4-a29d-4649-827a-ef4241c25104" xlink:href="frt-20221231.xsd#frt_InterestRateTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_InterestRateDomain_83a69247-1551-4abc-9ad6-ceb22d726b53" xlink:to="loc_frt_InterestRateTwoMember_c36451e4-a29d-4649-827a-ef4241c25104" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_40497d13-14ee-4095-8f42-491827465b96" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_MortgageLoansOnRealEstateScheduleTable_c6c05307-c2c4-4333-bd7d-6abfc1a9a5fc" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_40497d13-14ee-4095-8f42-491827465b96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_40497d13-14ee-4095-8f42-491827465b96_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_40497d13-14ee-4095-8f42-491827465b96" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_40497d13-14ee-4095-8f42-491827465b96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71abf4db-4889-4c69-9c92-36182c2af5b5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_40497d13-14ee-4095-8f42-491827465b96" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71abf4db-4889-4c69-9c92-36182c2af5b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SecondMortgageOnARetailShoppingCenterInRockvilleMDOneMember_422ec123-7c26-486a-9ab5-30e95e12bab8" xlink:href="frt-20221231.xsd#frt_SecondMortgageOnARetailShoppingCenterInRockvilleMDOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71abf4db-4889-4c69-9c92-36182c2af5b5" xlink:to="loc_frt_SecondMortgageOnARetailShoppingCenterInRockvilleMDOneMember_422ec123-7c26-486a-9ab5-30e95e12bab8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SecondMortgageOnARetailShoppingCenterInRockvilleMDTwoMember_4147673a-009f-4b84-b114-7865947a1d54" xlink:href="frt-20221231.xsd#frt_SecondMortgageOnARetailShoppingCenterInRockvilleMDTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71abf4db-4889-4c69-9c92-36182c2af5b5" xlink:to="loc_frt_SecondMortgageOnARetailShoppingCenterInRockvilleMDTwoMember_4147673a-009f-4b84-b114-7865947a1d54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_frt_SecondMortgageOnARetailShoppingCenterInBaltimoreMDMember_575c61a7-fa58-479b-a555-626202fc0bf8" xlink:href="frt-20221231.xsd#frt_SecondMortgageOnARetailShoppingCenterInBaltimoreMDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71abf4db-4889-4c69-9c92-36182c2af5b5" xlink:to="loc_frt_SecondMortgageOnARetailShoppingCenterInBaltimoreMDMember_575c61a7-fa58-479b-a555-626202fc0bf8" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
