<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.federalrealty.com/role/BusinessAndOrganization" xlink:href="frt-20140331.xsd#BusinessAndOrganization" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/BusinessAndOrganizationDetails" xlink:href="frt-20140331.xsd#BusinessAndOrganizationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/CommitmentsAndContingencies" xlink:href="frt-20140331.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/CommitmentsAndContingenciesDetails" xlink:href="frt-20140331.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/CommitmentsAndContingenciesTables" xlink:href="frt-20140331.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ComponentsOfRentalIncome" xlink:href="frt-20140331.xsd#ComponentsOfRentalIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ComponentsOfRentalIncomeScheduleOfMinimumRentDetails" xlink:href="frt-20140331.xsd#ComponentsOfRentalIncomeScheduleOfMinimumRentDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ComponentsOfRentalIncomeScheduleOfPrincipalComponentsOfRentalIncomeDetails" xlink:href="frt-20140331.xsd#ComponentsOfRentalIncomeScheduleOfPrincipalComponentsOfRentalIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ComponentsOfRentalIncomeTables" xlink:href="frt-20140331.xsd#ComponentsOfRentalIncomeTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedBalanceSheets" xlink:href="frt-20140331.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedBalanceSheetsParentheticals" xlink:href="frt-20140331.xsd#ConsolidatedBalanceSheetsParentheticals" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementOfShareholdersEquity" xlink:href="frt-20140331.xsd#ConsolidatedStatementOfShareholdersEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementOfShareholdersEquityParentheticals" xlink:href="frt-20140331.xsd#ConsolidatedStatementOfShareholdersEquityParentheticals" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="frt-20140331.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ConsolidatedStatementsOfOperations" xlink:href="frt-20140331.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/Debt" xlink:href="frt-20140331.xsd#Debt" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/DebtDetails" xlink:href="frt-20140331.xsd#DebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/DebtTables" xlink:href="frt-20140331.xsd#DebtTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/DiscontinuedOperations" xlink:href="frt-20140331.xsd#DiscontinuedOperations" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/DiscontinuedOperationsDetails" xlink:href="frt-20140331.xsd#DiscontinuedOperationsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/DiscontinuedOperationsTables" xlink:href="frt-20140331.xsd#DiscontinuedOperationsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/DocumentAndEntityInformationDocument" xlink:href="frt-20140331.xsd#DocumentAndEntityInformationDocument" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/EarningsPerShare" xlink:href="frt-20140331.xsd#EarningsPerShare" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/EarningsPerShareNarrativeDetails" xlink:href="frt-20140331.xsd#EarningsPerShareNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/EarningsPerShareScheduleOfEarningsPerShareDetails" xlink:href="frt-20140331.xsd#EarningsPerShareScheduleOfEarningsPerShareDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/EarningsPerShareTables" xlink:href="frt-20140331.xsd#EarningsPerShareTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/FairValueOfFinancialInstruments" xlink:href="frt-20140331.xsd#FairValueOfFinancialInstruments" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsSummaryOfCarryingAmountAndFairValueOfFinancialInstrumentsDetails" xlink:href="frt-20140331.xsd#FairValueOfFinancialInstrumentsSummaryOfCarryingAmountAndFairValueOfFinancialInstrumentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsTables" xlink:href="frt-20140331.xsd#FairValueOfFinancialInstrumentsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/RealEstate" xlink:href="frt-20140331.xsd#RealEstate" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/RealEstateDetails" xlink:href="frt-20140331.xsd#RealEstateDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/RealEstatePartnership" xlink:href="frt-20140331.xsd#RealEstatePartnership" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/RealEstatePartnershipNarrativeDetails" xlink:href="frt-20140331.xsd#RealEstatePartnershipNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/RealEstatePartnershipSummarizedOperatingResultsAndFinancialPositionOfPartnershipDetails" xlink:href="frt-20140331.xsd#RealEstatePartnershipSummarizedOperatingResultsAndFinancialPositionOfPartnershipDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/RealEstatePartnershipTables" xlink:href="frt-20140331.xsd#RealEstatePartnershipTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/RealEstateTables" xlink:href="frt-20140331.xsd#RealEstateTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ShareBasedCompensationDetails" xlink:href="frt-20140331.xsd#ShareBasedCompensationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ShareBasedCompensationPlans" xlink:href="frt-20140331.xsd#ShareBasedCompensationPlans" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ShareBasedCompensationPlansTables" xlink:href="frt-20140331.xsd#ShareBasedCompensationPlansTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ShareholdersEquity" xlink:href="frt-20140331.xsd#ShareholdersEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ShareholdersEquityNarrativeDetails" xlink:href="frt-20140331.xsd#ShareholdersEquityNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ShareholdersEquityShareholdersEquitySummaryOfDividendsDetails" xlink:href="frt-20140331.xsd#ShareholdersEquityShareholdersEquitySummaryOfDividendsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/ShareholdersEquityTables" xlink:href="frt-20140331.xsd#ShareholdersEquityTables" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="frt-20140331.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:href="frt-20140331.xsd#SummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesPolicy" xlink:href="frt-20140331.xsd#SummaryOfSignificantAccountingPoliciesPolicy" xlink:type="simple" />
  <roleRef roleURI="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="frt-20140331.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/BusinessAndOrganization" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/BusinessAndOrganizationDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/CommitmentsAndContingenciesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_A4745A252F254C642DFEB8EE78B36CF3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_3DE80AC50FD2E8B560D8B8EE78B333C0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_A4745A252F254C642DFEB8EE78B36CF3" xlink:to="loc_us-gaap_LossContingenciesTable_3DE80AC50FD2E8B560D8B8EE78B333C0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="frt-20140331.xsd#frt_ContractualObligationAxis" xlink:label="loc_frt_ContractualObligationAxis_9605814384C199D2785FB8EE78B393F3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_3DE80AC50FD2E8B560D8B8EE78B333C0" xlink:to="loc_frt_ContractualObligationAxis_9605814384C199D2785FB8EE78B393F3" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ContractualObligationDomain" xlink:label="loc_frt_ContractualObligationDomain_63DF0B064247EA89C671B8EE78B3FC07_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_ContractualObligationAxis_9605814384C199D2785FB8EE78B393F3" xlink:to="loc_frt_ContractualObligationDomain_63DF0B064247EA89C671B8EE78B3FC07_default" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ContractualObligationDomain" xlink:label="loc_frt_ContractualObligationDomain_63DF0B064247EA89C671B8EE78B3FC07" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_ContractualObligationAxis_9605814384C199D2785FB8EE78B393F3" xlink:to="loc_frt_ContractualObligationDomain_63DF0B064247EA89C671B8EE78B3FC07" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapitalAccountUnits" xlink:label="loc_us-gaap_PartnersCapitalAccountUnits_5E3FAC9CD2AC8989DDB5B8EE78B30055" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_A4745A252F254C642DFEB8EE78B36CF3" xlink:to="loc_us-gaap_PartnersCapitalAccountUnits_5E3FAC9CD2AC8989DDB5B8EE78B30055" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_OperatingPartnershipUnitsFairValue" xlink:label="loc_frt_OperatingPartnershipUnitsFairValue_2B222BE525FD76FD1185B8EE78B3E94C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_A4745A252F254C642DFEB8EE78B36CF3" xlink:to="loc_frt_OperatingPartnershipUnitsFairValue_2B222BE525FD76FD1185B8EE78B3E94C" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/ComponentsOfRentalIncome" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/ComponentsOfRentalIncomeScheduleOfMinimumRentDetails" xlink:type="extended">
    <loc xlink:href="frt-20140331.xsd#frt_MinimumRentLineItems" xlink:label="loc_frt_MinimumRentLineItems_3D4945E707C2A97B33DCB9A5C05B2476" xlink:type="locator" />
    <loc xlink:href="frt-20140331.xsd#frt_ScheduleOfMinimumRentsTable" xlink:label="loc_frt_ScheduleOfMinimumRentsTable_B0173418ABCDD0EE708EB9A5C05BD7E5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_frt_MinimumRentLineItems_3D4945E707C2A97B33DCB9A5C05B2476" xlink:to="loc_frt_ScheduleOfMinimumRentsTable_B0173418ABCDD0EE708EB9A5C05BD7E5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E6891E74E0FDCED76F37B9A5C05B0562" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_ScheduleOfMinimumRentsTable_B0173418ABCDD0EE708EB9A5C05BD7E5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E6891E74E0FDCED76F37B9A5C05B0562" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E6A61C4A2A7C65C5349B9A5C05B22D7_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E6891E74E0FDCED76F37B9A5C05B0562" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E6A61C4A2A7C65C5349B9A5C05B22D7_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E6A61C4A2A7C65C5349B9A5C05B22D7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E6891E74E0FDCED76F37B9A5C05B0562" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E6A61C4A2A7C65C5349B9A5C05B22D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AboveMarketLeasesMember" xlink:label="loc_us-gaap_AboveMarketLeasesMember_00408992F46FB55C9DC1B9A5C05B7512" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E6A61C4A2A7C65C5349B9A5C05B22D7" xlink:to="loc_us-gaap_AboveMarketLeasesMember_00408992F46FB55C9DC1B9A5C05B7512" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_BelowMarketLeaseMember" xlink:label="loc_frt_BelowMarketLeaseMember_36937F72881CEF676260B9A5C05B7D74" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_8E6A61C4A2A7C65C5349B9A5C05B22D7" xlink:to="loc_frt_BelowMarketLeaseMember_36937F72881CEF676260B9A5C05B7D74" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StraightLineRent" xlink:label="loc_us-gaap_StraightLineRent_CA53DD68FB68D9626EE9B9A5C05B1A9D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_MinimumRentLineItems_3D4945E707C2A97B33DCB9A5C05B2476" xlink:to="loc_us-gaap_StraightLineRent_CA53DD68FB68D9626EE9B9A5C05B1A9D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AmortizationOfAboveAndBelowMarketLeases" xlink:label="loc_us-gaap_AmortizationOfAboveAndBelowMarketLeases_DBEDD490E15153922632B9A5C05B95E6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_MinimumRentLineItems_3D4945E707C2A97B33DCB9A5C05B2476" xlink:to="loc_us-gaap_AmortizationOfAboveAndBelowMarketLeases_DBEDD490E15153922632B9A5C05B95E6" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ComponentsOfRentalIncomeScheduleOfPrincipalComponentsOfRentalIncomeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D730B35454C7FEF9B7AF61B0CFD2F802" xlink:type="locator" />
    <loc xlink:href="frt-20140331.xsd#frt_ComponentsOfRentalIncomeTable" xlink:label="loc_frt_ComponentsOfRentalIncomeTable_FB5F502C486B286485FA61B0CFD214A9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D730B35454C7FEF9B7AF61B0CFD2F802" xlink:to="loc_frt_ComponentsOfRentalIncomeTable_FB5F502C486B286485FA61B0CFD214A9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductOrServiceAxis" xlink:label="loc_us-gaap_ProductOrServiceAxis_B877E5C5552C66191CC661B0CFD26088" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_ComponentsOfRentalIncomeTable_FB5F502C486B286485FA61B0CFD214A9" xlink:to="loc_us-gaap_ProductOrServiceAxis_B877E5C5552C66191CC661B0CFD26088" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_E11CE23145EF51FCB92261B0CFD2C3AC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ProductOrServiceAxis_B877E5C5552C66191CC661B0CFD26088" xlink:to="loc_us-gaap_ProductsAndServicesDomain_E11CE23145EF51FCB92261B0CFD2C3AC_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_E11CE23145EF51FCB92261B0CFD2C3AC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ProductOrServiceAxis_B877E5C5552C66191CC661B0CFD26088" xlink:to="loc_us-gaap_ProductsAndServicesDomain_E11CE23145EF51FCB92261B0CFD2C3AC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommercialRealEstateMember" xlink:label="loc_us-gaap_CommercialRealEstateMember_36854DECF2501B86171161B0CFD264A3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_E11CE23145EF51FCB92261B0CFD2C3AC" xlink:to="loc_us-gaap_CommercialRealEstateMember_36854DECF2501B86171161B0CFD264A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResidentialRealEstateMember" xlink:label="loc_us-gaap_ResidentialRealEstateMember_E3C030580CE293DC8C7061B0CFD22940" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_E11CE23145EF51FCB92261B0CFD2C3AC" xlink:to="loc_us-gaap_ResidentialRealEstateMember_E3C030580CE293DC8C7061B0CFD22940" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue" xlink:label="loc_us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue_546EFAC12A404134AC9161B0CFD247F6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D730B35454C7FEF9B7AF61B0CFD2F802" xlink:to="loc_us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue_546EFAC12A404134AC9161B0CFD247F6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_TenantReimbursements" xlink:label="loc_us-gaap_TenantReimbursements_E20D6C91D3AC68D9539F61B0CFD2AF97" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D730B35454C7FEF9B7AF61B0CFD2F802" xlink:to="loc_us-gaap_TenantReimbursements_E20D6C91D3AC68D9539F61B0CFD2AF97" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PercentageRent" xlink:label="loc_us-gaap_PercentageRent_3AB29CA0BF49B27C2E7961B0CFD22580" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D730B35454C7FEF9B7AF61B0CFD2F802" xlink:to="loc_us-gaap_PercentageRent_3AB29CA0BF49B27C2E7961B0CFD22580" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_OtherRentalIncome" xlink:label="loc_frt_OtherRentalIncome_DED73BF306A2E7C4105261B0CFD2D3F3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D730B35454C7FEF9B7AF61B0CFD2F802" xlink:to="loc_frt_OtherRentalIncome_DED73BF306A2E7C4105261B0CFD2D3F3" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_RentalIncome" xlink:label="loc_frt_RentalIncome_F509C64BB77D1827E1BA61B0CFD24A8D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D730B35454C7FEF9B7AF61B0CFD2F802" xlink:to="loc_frt_RentalIncome_F509C64BB77D1827E1BA61B0CFD24A8D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ComponentsOfRentalIncomeTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_FE0094412F8503E502E2B4C2632423DD" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_327AF9AC60E52AB350F2B4C263233E4C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_FE0094412F8503E502E2B4C2632423DD" xlink:to="loc_us-gaap_StatementTable_327AF9AC60E52AB350F2B4C263233E4C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_59501097DB858051CA06B4C263234B8B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_327AF9AC60E52AB350F2B4C263233E4C" xlink:to="loc_us-gaap_StatementClassOfStockAxis_59501097DB858051CA06B4C263234B8B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_A599C74A638BBCEBEA6EB4C26323737C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_59501097DB858051CA06B4C263234B8B" xlink:to="loc_us-gaap_ClassOfStockDomain_A599C74A638BBCEBEA6EB4C26323737C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_A599C74A638BBCEBEA6EB4C26323737C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_59501097DB858051CA06B4C263234B8B" xlink:to="loc_us-gaap_ClassOfStockDomain_A599C74A638BBCEBEA6EB4C26323737C" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_36AF92FBEE6A0F1E4A27B4C263235F98" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_A599C74A638BBCEBEA6EB4C26323737C" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_36AF92FBEE6A0F1E4A27B4C263235F98" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_EE517BB78E00586DCD5BB4C263238E85" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_327AF9AC60E52AB350F2B4C263233E4C" xlink:to="loc_dei_LegalEntityAxis_EE517BB78E00586DCD5BB4C263238E85" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_FB7493A1CBB96F204E8AB4C263232312_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_EE517BB78E00586DCD5BB4C263238E85" xlink:to="loc_dei_EntityDomain_FB7493A1CBB96F204E8AB4C263232312_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_FB7493A1CBB96F204E8AB4C263232312" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_EE517BB78E00586DCD5BB4C263238E85" xlink:to="loc_dei_EntityDomain_FB7493A1CBB96F204E8AB4C263232312" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FE0094412F8503E502E2B4C2632423DD" xlink:to="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RentalProperties" xlink:label="loc_us-gaap_RentalProperties_FEEF5FC7CF3A6C38B059B4C26324C338" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_RentalProperties_FEEF5FC7CF3A6C38B059B4C26324C338" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_C689A6BE27E8A7BA446DB4C26324D234" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_ConstructionInProgressGross_C689A6BE27E8A7BA446DB4C26324D234" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateInvestmentPropertyAtCost" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAtCost_592E732FA6FDB970B4BEB4C26324E0DC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyAtCost_592E732FA6FDB970B4BEB4C26324E0DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_67FD886D6C2F41EEDF7BB4C263241A7D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation_67FD886D6C2F41EEDF7BB4C263241A7D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateInvestmentPropertyNet" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyNet_333A860A6105164F828EB4C26324EB2E" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyNet_333A860A6105164F828EB4C26324EB2E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_02FD23042F4F4EA18057B4C26326D0C8" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_02FD23042F4F4EA18057B4C26326D0C8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsAndNotesReceivableNet" xlink:label="loc_us-gaap_AccountsAndNotesReceivableNet_951D4F10D7AA5577CDFCB4C263262573" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_AccountsAndNotesReceivableNet_951D4F10D7AA5577CDFCB4C263262573" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_A468A66560A00FF7EF6EB4C26326BAFF" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_A468A66560A00FF7EF6EB4C26326BAFF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_16CFA4B3CD2D3FB9E606B4C26326AEE7" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_16CFA4B3CD2D3FB9E606B4C26326AEE7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssets" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_63805F4AB7C474F6C6F1B4C263268C51" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_63805F4AB7C474F6C6F1B4C263268C51" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_0ECDCBC0DFECEBF983AAB4C26326C729" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_0ECDCBC0DFECEBF983AAB4C26326C729" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_B75906ACF58949EA8291B4C263266364" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_ED829E4E7025F6F5C603B4C26324880C" xlink:to="loc_us-gaap_Assets_B75906ACF58949EA8291B4C263266364" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FE0094412F8503E502E2B4C2632423DD" xlink:to="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_2A7DA390D8FE68A89E0FB4C263262CEF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_SecuredDebt_2A7DA390D8FE68A89E0FB4C263262CEF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalLeaseObligations" xlink:label="loc_us-gaap_CapitalLeaseObligations_77A7DEE6ECE368FD18FDB4C263260222" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_CapitalLeaseObligations_77A7DEE6ECE368FD18FDB4C263260222" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesPayable" xlink:label="loc_us-gaap_NotesPayable_A39E016612B59F48DF94B4C26327C3A8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_NotesPayable_A39E016612B59F48DF94B4C26327C3A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SeniorNotes" xlink:label="loc_us-gaap_SeniorNotes_342F76829BFE5B9F604FB4C2632774A8" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_SeniorNotes_342F76829BFE5B9F604FB4C2632774A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_54A0D08C23378CA372E3B4C26327B15F" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_54A0D08C23378CA372E3B4C26327B15F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_D719F7147FF88ECB2744B4C263276373" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_D719F7147FF88ECB2744B4C263276373" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SecurityDepositLiability" xlink:label="loc_us-gaap_SecurityDepositLiability_A4BB88D2A0CD88E34D0FB4C26327BDF2" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_SecurityDepositLiability_A4BB88D2A0CD88E34D0FB4C26327BDF2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredCreditsAndOtherLiabilities" xlink:label="loc_us-gaap_DeferredCreditsAndOtherLiabilities_6A38B2D0DD70DDC0812BB4C26327A1C0" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_DeferredCreditsAndOtherLiabilities_6A38B2D0DD70DDC0812BB4C26327A1C0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_64BAB464D1E03C3E59DDB4C26327D6B4" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_Liabilities_64BAB464D1E03C3E59DDB4C26327D6B4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_31EA7333EE905D08C028B4C263274E43" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_CommitmentsAndContingencies_31EA7333EE905D08C028B4C263274E43" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_39888F14E79AA3DF8F82B4C26327FABE" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_A5EC1878558CE68B00BEB4C26326375D" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_39888F14E79AA3DF8F82B4C26327FABE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_FE0094412F8503E502E2B4C2632423DD" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_11550F33C7D43916BAD9B4C263277DA4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_PreferredStockValue_11550F33C7D43916BAD9B4C263277DA4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_03D1C97779592F2DB7FBB4C2632712B1" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_CommonStockValue_03D1C97779592F2DB7FBB4C2632712B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9E7492F6930F01D39976B4C2632783FB" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9E7492F6930F01D39976B4C2632783FB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDistributionsInExcessOfNetIncome" xlink:label="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncome_55E82BB8997A96586E39B4C263278F59" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncome_55E82BB8997A96586E39B4C263278F59" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D3B3BB53DAAE75E64A65B4C26327470C" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D3B3BB53DAAE75E64A65B4C26327470C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_4E11E534B8D46475554DB4C26327FF36" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_StockholdersEquity_4E11E534B8D46475554DB4C26327FF36" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_EBC1D1BF22F37E941E21B4C263273A1C" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_MinorityInterest_EBC1D1BF22F37E941E21B4C263273A1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_23EC41EBD9A87A4EF55BB4C263281422" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_23EC41EBD9A87A4EF55BB4C263281422" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_A48B88565DC43ED2414CB4C26328B79F" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_65F54429C6FFA2A3923FB4C26327AF14" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_A48B88565DC43ED2414CB4C26328B79F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedBalanceSheetsParentheticals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_10152973E2B333CF3888CE01AD33FC97" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_StatementTable_10152973E2B333CF3888CE01AD33FC97" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_5C16051FADB954EE5DDDCE01AD35C139" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_10152973E2B333CF3888CE01AD33FC97" xlink:to="loc_us-gaap_StatementScenarioAxis_5C16051FADB954EE5DDDCE01AD35C139" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_DBB5CF2D3F3EE8364880CE01AD35D9B8_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_5C16051FADB954EE5DDDCE01AD35C139" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_DBB5CF2D3F3EE8364880CE01AD35D9B8_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_DBB5CF2D3F3EE8364880CE01AD35D9B8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_5C16051FADB954EE5DDDCE01AD35C139" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_DBB5CF2D3F3EE8364880CE01AD35D9B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_A076D1BC14479CFFFD21CE01AD35EA31" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_10152973E2B333CF3888CE01AD33FC97" xlink:to="loc_us-gaap_StatementClassOfStockAxis_A076D1BC14479CFFFD21CE01AD35EA31" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_EABFD1CCB482B337D943CE01AD35E200_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_A076D1BC14479CFFFD21CE01AD35EA31" xlink:to="loc_us-gaap_ClassOfStockDomain_EABFD1CCB482B337D943CE01AD35E200_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_EABFD1CCB482B337D943CE01AD35E200" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_A076D1BC14479CFFFD21CE01AD35EA31" xlink:to="loc_us-gaap_ClassOfStockDomain_EABFD1CCB482B337D943CE01AD35E200" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_1C05AA0296C6928F4F67CE01AD35B24F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_EABFD1CCB482B337D943CE01AD35E200" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_1C05AA0296C6928F4F67CE01AD35B24F" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_OperatingRealEstateFromConsolidatedVariableInterestEntities" xlink:label="loc_frt_OperatingRealEstateFromConsolidatedVariableInterestEntities_3FE02963F04B5067632ECE01AD36C8FB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_frt_OperatingRealEstateFromConsolidatedVariableInterestEntities_3FE02963F04B5067632ECE01AD36C8FB" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities" xlink:label="loc_frt_AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities_52678557D856263B9FB5CE01AD36A5BC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_frt_AccumulatedDepreciationAndAmortizationConsolidatedVariableInterestEntities_52678557D856263B9FB5CE01AD36A5BC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedAmortizationDeferredFinanceCosts" xlink:label="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_949BA40B987CBEFE5DF2CE01AD36F133" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_AccumulatedAmortizationDeferredFinanceCosts_949BA40B987CBEFE5DF2CE01AD36F133" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_MortgagePayableFromConsolidatedVariableInterestEntities" xlink:label="loc_frt_MortgagePayableFromConsolidatedVariableInterestEntities_0649D3DCEDD705C14E6DCE01AD36F796" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_frt_MortgagePayableFromConsolidatedVariableInterestEntities_0649D3DCEDD705C14E6DCE01AD36F796" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_8D0B43FFAB563FCD18ABCE01AD367D0B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_8D0B43FFAB563FCD18ABCE01AD367D0B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_7041E5AEA70F76621594CE01AD36C584" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_7041E5AEA70F76621594CE01AD36C584" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_006236FCC2F738BB81D4CE01AD365491" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_006236FCC2F738BB81D4CE01AD365491" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockLiquidationPreference" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_1564883929447C0ACDB5CE01AD36A830" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_1564883929447C0ACDB5CE01AD36A830" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_E91002B8D786E436778BCE01AD36DEBC" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_PreferredStockSharesIssued_E91002B8D786E436778BCE01AD36DEBC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_46A242C7FB6A51998270CE01AD3664F6" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_46A242C7FB6A51998270CE01AD3664F6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_D58BED1F6C6E1F298AEACE01AD373F6F" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_D58BED1F6C6E1F298AEACE01AD373F6F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_F2D197A2C1F86DF64D67CE01AD37BCCC" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_F2D197A2C1F86DF64D67CE01AD37BCCC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_C94B1F692D2D36D548D7CE01AD3729DF" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_CommonStockSharesIssued_C94B1F692D2D36D548D7CE01AD3729DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_99148D23D68AEA32E12FCE01AD37F325" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_C0E36FADD4261CDF2E53CE01AD36678F" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_99148D23D68AEA32E12FCE01AD37F325" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementOfShareholdersEquity" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_8B23FE85C00C9A56D9DBB7F1A2EE4518" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StatementTable_8B23FE85C00C9A56D9DBB7F1A2EE4518" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_DB3B694E4C6105003CDEB7F1A2EE9093" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8B23FE85C00C9A56D9DBB7F1A2EE4518" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_DB3B694E4C6105003CDEB7F1A2EE9093" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_DB3B694E4C6105003CDEB7F1A2EE9093" xlink:to="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_DB3B694E4C6105003CDEB7F1A2EE9093" xlink:to="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="loc_us-gaap_PreferredStockMember_72BBC035E41DD85CB980B7F1A2EED543" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:to="loc_us-gaap_PreferredStockMember_72BBC035E41DD85CB980B7F1A2EED543" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_29B93373C7C68B131DCCB7F1A2EE2F03" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:to="loc_us-gaap_CommonStockMember_29B93373C7C68B131DCCB7F1A2EE2F03" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_6D264E2363CAFFEE4CD9B7F1A2EECFD0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_6D264E2363CAFFEE4CD9B7F1A2EECFD0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember" xlink:label="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_2C55D3FB85AA862ACAFAB7F1A2EE01EF" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:to="loc_us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember_2C55D3FB85AA862ACAFAB7F1A2EE01EF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_A446DF3F07DC3230A1B7B7F1A2EEDA20" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_A446DF3F07DC3230A1B7B7F1A2EEDA20" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_954FFDDD8C6B3A950687B7F1A2EEE43F" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_C02C25CFEFF0CA218EA1B7F1A2EE5DDD" xlink:to="loc_us-gaap_NoncontrollingInterestMember_954FFDDD8C6B3A950687B7F1A2EEE43F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaap_SharesOutstanding_87F058F755BF513CCCB1B7F1A2EE7FAA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_SharesOutstanding_87F058F755BF513CCCB1B7F1A2EE7FAA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0860EA17F568D6005C62B7F1A2EE1068" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0860EA17F568D6005C62B7F1A2EE1068" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ProfitLossExcludingRedeemableNoncontrollingInterests" xlink:label="loc_frt_ProfitLossExcludingRedeemableNoncontrollingInterests_7D0C0D59E0B14A5EBB67B7F1A2EE4129" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_frt_ProfitLossExcludingRedeemableNoncontrollingInterests_7D0C0D59E0B14A5EBB67B7F1A2EE4129" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_FCA65231BD4554A50042B7F1A2EEB0F6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_FCA65231BD4554A50042B7F1A2EEB0F6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_834C0A997B573EBC2284B7F1A2EE63C6" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_DividendsCommonStockCash_834C0A997B573EBC2284B7F1A2EE63C6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DividendsPreferredStockCash" xlink:label="loc_us-gaap_DividendsPreferredStockCash_44FD0345B73AEA0F6DA6B7F1A2EE06B8" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_DividendsPreferredStockCash_44FD0345B73AEA0F6DA6B7F1A2EE06B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_630BFB6A2C74A0478BD6B7F1A2EECF2A" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_630BFB6A2C74A0478BD6B7F1A2EECF2A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_9F76F8F5960C5CB1AB0AB7F1A2EE1A73" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_9F76F8F5960C5CB1AB0AB7F1A2EE1A73" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_B6E900D45C33EC3B1354B7F1A2EE2722" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_B6E900D45C33EC3B1354B7F1A2EE2722" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_D96E45728D7E4B49FAA3B7F1A2EE7789" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_D96E45728D7E4B49FAA3B7F1A2EE7789" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_81DA56DC19B6EE614480B7F1A2EEA64E" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_81DA56DC19B6EE614480B7F1A2EEA64E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_734D329C1F9E61CF1EB5B7F1A2EEFB5B" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan_734D329C1F9E61CF1EB5B7F1A2EEFB5B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_9BBD27519CA8543E2D63B7F1A2EE2ECE" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_9BBD27519CA8543E2D63B7F1A2EE2ECE" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ShareBasedCompensationExpenseNetShares" xlink:label="loc_frt_ShareBasedCompensationExpenseNetShares_1A408C079A9595B54ABAB7F1A2EEF6BC" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_frt_ShareBasedCompensationExpenseNetShares_1A408C079A9595B54ABAB7F1A2EEF6BC" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ShareBasedCompensationExpenseNetValue" xlink:label="loc_frt_ShareBasedCompensationExpenseNetValue_F479ECCC1DFC76EBF110B7F1A2EE6E12" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_frt_ShareBasedCompensationExpenseNetValue_F479ECCC1DFC76EBF110B7F1A2EE6E12" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_2F96555D008D5220E09EB7F1A2EED98B" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_2F96555D008D5220E09EB7F1A2EED98B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquityOther" xlink:label="loc_us-gaap_StockholdersEquityOther_C910BD8F1C633A658F14B7F1A2EEF083" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DDB035CC339FFA3E0131B7F1A2EE7CC6" xlink:to="loc_us-gaap_StockholdersEquityOther_C910BD8F1C633A658F14B7F1A2EEF083" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementOfShareholdersEquityParentheticals" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_EF245195D34E99131ED1CE3136A75754" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_40C8B243532676065CC1CE3136A76117" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_EF245195D34E99131ED1CE3136A75754" xlink:to="loc_us-gaap_StatementTable_40C8B243532676065CC1CE3136A76117" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_5002412051EE5C740CDACE3136A76706" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_40C8B243532676065CC1CE3136A76117" xlink:to="loc_us-gaap_StatementScenarioAxis_5002412051EE5C740CDACE3136A76706" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_0FD281CE214E91815989CE3136A7EA84_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_5002412051EE5C740CDACE3136A76706" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_0FD281CE214E91815989CE3136A7EA84_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_0FD281CE214E91815989CE3136A7EA84" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_5002412051EE5C740CDACE3136A76706" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_0FD281CE214E91815989CE3136A7EA84" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_4F08751AC716DEF3DD04CE3136A7F693" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EF245195D34E99131ED1CE3136A75754" xlink:to="loc_us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest_4F08751AC716DEF3DD04CE3136A7F693" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D2E5137959238C4A847ECE31368C12BB" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_CF83C3A9E79731678CD9CE31368C8A81" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D2E5137959238C4A847ECE31368C12BB" xlink:to="loc_us-gaap_StatementTable_CF83C3A9E79731678CD9CE31368C8A81" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_C63A2F3A70892B07A750CE31368C03A0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_CF83C3A9E79731678CD9CE31368C8A81" xlink:to="loc_dei_LegalEntityAxis_C63A2F3A70892B07A750CE31368C03A0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_84FAB13C0C1B1F40AF8FCE31368C8360_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_C63A2F3A70892B07A750CE31368C03A0" xlink:to="loc_dei_EntityDomain_84FAB13C0C1B1F40AF8FCE31368C8360_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_84FAB13C0C1B1F40AF8FCE31368C8360" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_C63A2F3A70892B07A750CE31368C03A0" xlink:to="loc_dei_EntityDomain_84FAB13C0C1B1F40AF8FCE31368C8360" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_695269A9797153460CBCCE31368C05DF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D2E5137959238C4A847ECE31368C12BB" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_695269A9797153460CBCCE31368C05DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_3822033659FFA98C6DBDCE31368C9D00" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_695269A9797153460CBCCE31368C05DF" xlink:to="loc_us-gaap_ProfitLoss_3822033659FFA98C6DBDCE31368C9D00" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_97F1BB05EAFE30A25313CE31368C1069" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_695269A9797153460CBCCE31368C05DF" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_97F1BB05EAFE30A25313CE31368C1069" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_AdjustmentDepreciationAndAmortization" xlink:label="loc_frt_AdjustmentDepreciationAndAmortization_5FB1040BD944D1FA5735CE3136911B6C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_97F1BB05EAFE30A25313CE31368C1069" xlink:to="loc_frt_AdjustmentDepreciationAndAmortization_5FB1040BD944D1FA5735CE3136911B6C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_6EB61A56245A416BC629CE31369135AD" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_97F1BB05EAFE30A25313CE31368C1069" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_6EB61A56245A416BC629CE31369135AD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_7B17AFD490A597C68F5CCE31369300C6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_97F1BB05EAFE30A25313CE31368C1069" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_7B17AFD490A597C68F5CCE31369300C6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9A6C036212ECFBF34EE9CE313693382B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_695269A9797153460CBCCE31368C05DF" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9A6C036212ECFBF34EE9CE313693382B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_D5ECA06D8F887E5AA856CE3136936BFE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9A6C036212ECFBF34EE9CE313693382B" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_D5ECA06D8F887E5AA856CE3136936BFE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_8069CA2449ABAE448E31CE3136937951" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9A6C036212ECFBF34EE9CE313693382B" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_8069CA2449ABAE448E31CE3136937951" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_9E707F403434F09C5B0DCE313693ECC7" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9A6C036212ECFBF34EE9CE313693382B" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_9E707F403434F09C5B0DCE313693ECC7" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_IncreaseDecreaseInSecurityDepositsAndOtherLiabilities" xlink:label="loc_frt_IncreaseDecreaseInSecurityDepositsAndOtherLiabilities_EE832AAA7745D5371069CE313693A3F3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9A6C036212ECFBF34EE9CE313693382B" xlink:to="loc_frt_IncreaseDecreaseInSecurityDepositsAndOtherLiabilities_EE832AAA7745D5371069CE313693A3F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_C34661CE5B52F058BD3BCE313693CB63" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_695269A9797153460CBCCE31368C05DF" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_C34661CE5B52F058BD3BCE313693CB63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D2E5137959238C4A847ECE31368C12BB" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireRealEstate" xlink:label="loc_us-gaap_PaymentsToAcquireRealEstate_15E7AA9045CF3C952147CE31369336C3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:to="loc_us-gaap_PaymentsToAcquireRealEstate_15E7AA9045CF3C952147CE31369336C3" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_CapitalExpendituresDevelopmentRedevelopment" xlink:label="loc_frt_CapitalExpendituresDevelopmentRedevelopment_1EFCC12F5B0558EA2B1CCE3136935689" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:to="loc_frt_CapitalExpendituresDevelopmentRedevelopment_1EFCC12F5B0558EA2B1CCE3136935689" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForCapitalImprovements" xlink:label="loc_us-gaap_PaymentsForCapitalImprovements_BEE78D3A2BAD3264CBA0CE313693F6F8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:to="loc_us-gaap_PaymentsForCapitalImprovements_BEE78D3A2BAD3264CBA0CE313693F6F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships" xlink:label="loc_us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships_FCEB19F292C9D0D51078CE313693C10C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:to="loc_us-gaap_ProceedsFromDistributionsReceivedFromRealEstatePartnerships_FCEB19F292C9D0D51078CE313693C10C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInLeaseAcquisitionCosts" xlink:label="loc_us-gaap_IncreaseDecreaseInLeaseAcquisitionCosts_5B529F4A6883B5D8C661CE3136932A01" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:to="loc_us-gaap_IncreaseDecreaseInLeaseAcquisitionCosts_5B529F4A6883B5D8C661CE3136932A01" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_IssuanceAndRepaymentsOfMortgageAndOtherNotesReceivableNet" xlink:label="loc_frt_IssuanceAndRepaymentsOfMortgageAndOtherNotesReceivableNet_4AB4253FEAA1EC0E5139CE313693E537" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:to="loc_frt_IssuanceAndRepaymentsOfMortgageAndOtherNotesReceivableNet_4AB4253FEAA1EC0E5139CE313693E537" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_F8BA5B9DBEB759A31C9ECE3136937017" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4CCFA159170B304DC6A5CE31369309E9" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_F8BA5B9DBEB759A31C9ECE3136937017" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_608845B7BC229113DFAFCE3136938D84" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D2E5137959238C4A847ECE31368C12BB" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_608845B7BC229113DFAFCE3136938D84" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_77C103554BCDE835CEE0CE313693A084" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_608845B7BC229113DFAFCE3136938D84" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities_77C103554BCDE835CEE0CE313693A084" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_822DE40A7DFF1ECB9026CE313699F28A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_608845B7BC229113DFAFCE3136938D84" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_822DE40A7DFF1ECB9026CE313699F28A" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_DividendsPaidToCommonAndPreferredShareholders" xlink:label="loc_frt_DividendsPaidToCommonAndPreferredShareholders_9B8AAA45B8C013349E2DCE313699F0A2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_608845B7BC229113DFAFCE3136938D84" xlink:to="loc_frt_DividendsPaidToCommonAndPreferredShareholders_9B8AAA45B8C013349E2DCE313699F0A2" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_Paymentsofdividendsandredemptionsminorityinterest" xlink:label="loc_frt_Paymentsofdividendsandredemptionsminorityinterest_50CD35C3FAF1A7818329CE3136995AFD" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_608845B7BC229113DFAFCE3136938D84" xlink:to="loc_frt_Paymentsofdividendsandredemptionsminorityinterest_50CD35C3FAF1A7818329CE3136995AFD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_65827072F319E1F077F4CE313699A3BA" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_608845B7BC229113DFAFCE3136938D84" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_65827072F319E1F077F4CE313699A3BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_848F9A4C1BFFD0032307CE3136994B26" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D2E5137959238C4A847ECE31368C12BB" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_848F9A4C1BFFD0032307CE3136994B26" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BFBDE1F254A82077FFD6CE3136991DDF" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D2E5137959238C4A847ECE31368C12BB" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_BFBDE1F254A82077FFD6CE3136991DDF" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_0FB81C6A8DA35A7DAAA4CE2C653E76CB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_StatementTable_0FB81C6A8DA35A7DAAA4CE2C653E76CB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_395A010445048E0EDB8FCE2C653E47F6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0FB81C6A8DA35A7DAAA4CE2C653E76CB" xlink:to="loc_dei_LegalEntityAxis_395A010445048E0EDB8FCE2C653E47F6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_E65F77F54E5013DD382CCE2C653E8953_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_395A010445048E0EDB8FCE2C653E47F6" xlink:to="loc_dei_EntityDomain_E65F77F54E5013DD382CCE2C653E8953_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_E65F77F54E5013DD382CCE2C653E8953" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_395A010445048E0EDB8FCE2C653E47F6" xlink:to="loc_dei_EntityDomain_E65F77F54E5013DD382CCE2C653E8953" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_5F2152226726AEE9D209CE2C653EFD68" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_RevenuesAbstract_5F2152226726AEE9D209CE2C653EFD68" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_RentalIncome" xlink:label="loc_frt_RentalIncome_80A318C63A5E621A4647CE2C653F1E57" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_5F2152226726AEE9D209CE2C653EFD68" xlink:to="loc_frt_RentalIncome_80A318C63A5E621A4647CE2C653F1E57" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherRealEstateRevenue" xlink:label="loc_us-gaap_OtherRealEstateRevenue_8EE7C242ABA340C78383CE2C653F550E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_5F2152226726AEE9D209CE2C653EFD68" xlink:to="loc_us-gaap_OtherRealEstateRevenue_8EE7C242ABA340C78383CE2C653F550E" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_RevenueMortgageInterest" xlink:label="loc_frt_RevenueMortgageInterest_E0B057E8825848AE74ECCE2C653FAC40" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_5F2152226726AEE9D209CE2C653EFD68" xlink:to="loc_frt_RevenueMortgageInterest_E0B057E8825848AE74ECCE2C653FAC40" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_DE01030EE3ED43EA0735CE2C653F89C9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_5F2152226726AEE9D209CE2C653EFD68" xlink:to="loc_us-gaap_Revenues_DE01030EE3ED43EA0735CE2C653F89C9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment" xlink:label="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_89052E1B41A00D711EEACE2C653FCD2A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment_89052E1B41A00D711EEACE2C653FCD2A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateTaxExpense" xlink:label="loc_us-gaap_RealEstateTaxExpense_61D8797D5125C3281F1CCE2C653F0751" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_RealEstateTaxExpense_61D8797D5125C3281F1CCE2C653F0751" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_C25FD4D5D6E96243E757CE2C653F8208" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_C25FD4D5D6E96243E757CE2C653F8208" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_E5B59AC04FD0127B0C59CE2C653FE116" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_DepreciationAndAmortization_E5B59AC04FD0127B0C59CE2C653FE116" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_FA934E2E2D6BEAF39DC8CE2C653FAA9C" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_OperatingExpenses_FA934E2E2D6BEAF39DC8CE2C653FAA9C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_6D466BF17BC6DFA598F8CE2C6540C478" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_OperatingIncomeLoss_6D466BF17BC6DFA598F8CE2C6540C478" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestIncomeOther" xlink:label="loc_us-gaap_InterestIncomeOther_70223CEF989623E7AEFCCE2C65404E96" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_InterestIncomeOther_70223CEF989623E7AEFCCE2C65404E96" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_50ECCE2E3C9E486DE692CE2C6540E9B3" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_InterestExpense_50ECCE2E3C9E486DE692CE2C6540E9B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_7D9F211FD865CAA7E9E6CE2C654018E9" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_7D9F211FD865CAA7E9E6CE2C654018E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_C2A9E0ED1B4A6ABC0528CE2C654083E6" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_99BC42B644E66E0C9315CE2C653F952D" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_C2A9E0ED1B4A6ABC0528CE2C654083E6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax_FBEC4656D148CAF0E701CE2C65406678" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax_FBEC4656D148CAF0E701CE2C65406678" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_5EB102AD9A63E4DA55B3CE2C6540FAC5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:to="loc_us-gaap_ProfitLoss_5EB102AD9A63E4DA55B3CE2C6540FAC5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_814604B303C59887FFF0CE2C6540FCAE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_814604B303C59887FFF0CE2C6540FCAE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_4BAEE0FCA7AE71FACBD9CE2C65421EA4" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:to="loc_us-gaap_NetIncomeLoss_4BAEE0FCA7AE71FACBD9CE2C65421EA4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_007D408553B04B8E901DCE2C6542E7E3" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_007D408553B04B8E901DCE2C6542E7E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_1ABEB5CBBAB24DBD02BACE2C654212FF" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract_2F83D5AF6DC9E3B52A26CE30DD5AFD82" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_1ABEB5CBBAB24DBD02BACE2C654212FF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_8DE4AE86D6137B301962CE2C65426566" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_8DE4AE86D6137B301962CE2C65426566" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_0590618155A31C748DD6CE2C65422BF3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_8DE4AE86D6137B301962CE2C65426566" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_0590618155A31C748DD6CE2C65422BF3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_2734E924730746617F1ECE2C65422513" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_8DE4AE86D6137B301962CE2C65426566" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_2734E924730746617F1ECE2C65422513" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_22DFAFC5DDC2214B4979CE2C65421AA1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_8DE4AE86D6137B301962CE2C65426566" xlink:to="loc_us-gaap_EarningsPerShareBasic_22DFAFC5DDC2214B4979CE2C65421AA1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_CB241214B238A1E2D7A8CE2C65426618" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_CB241214B238A1E2D7A8CE2C65426618" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_1990534C49D525743167CE2C6542C6F7" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_1990534C49D525743167CE2C6542C6F7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_625F48B3C4BA1DAA0244CE2C6542F1A6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_1990534C49D525743167CE2C6542C6F7" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_625F48B3C4BA1DAA0244CE2C6542F1A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_D9D9C3CC161AD5ABA836CE2C654379DA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_1990534C49D525743167CE2C6542C6F7" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_D9D9C3CC161AD5ABA836CE2C654379DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_E3A273DC61056AE2064FCE2C6543B79E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_1990534C49D525743167CE2C6542C6F7" xlink:to="loc_us-gaap_EarningsPerShareDiluted_E3A273DC61056AE2064FCE2C6543B79E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_B19C776493A90B867F84CE2C6543635B" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_B19C776493A90B867F84CE2C6543635B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_C313CFC6C9597F0F0B0CCE2C6543628E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_C313CFC6C9597F0F0B0CCE2C6543628E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_1FBB2BC06CB37B8B4ECBCE2C6543E581" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0258A188C4846983FFB2CE2C653EB914" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_1FBB2BC06CB37B8B4ECBCE2C6543E581" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/Debt" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/DebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_F1CFE002EFF48664E02ECE3135CB63DC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_DebtInstrumentTable_F1CFE002EFF48664E02ECE3135CB63DC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_AEA919A8CDF40E898B3CCE3135CB3C17" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_F1CFE002EFF48664E02ECE3135CB63DC" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_AEA919A8CDF40E898B3CCE3135CB3C17" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4AF9AF202E198294BE87CE3135CCFBF6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_AEA919A8CDF40E898B3CCE3135CB3C17" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4AF9AF202E198294BE87CE3135CCFBF6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain" xlink:label="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4AF9AF202E198294BE87CE3135CCFBF6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_AEA919A8CDF40E898B3CCE3135CB3C17" xlink:to="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4AF9AF202E198294BE87CE3135CCFBF6" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_Brook35Member" xlink:label="loc_frt_Brook35Member_99E2BADDC923A7B0E8CBCE3135CC194B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4AF9AF202E198294BE87CE3135CCFBF6" xlink:to="loc_frt_Brook35Member_99E2BADDC923A7B0E8CBCE3135CC194B" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_TheGroveatShrewsburyEastMember" xlink:label="loc_frt_TheGroveatShrewsburyEastMember_124CC6292A0DF9E46DF4CE3135CCE470" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4AF9AF202E198294BE87CE3135CCFBF6" xlink:to="loc_frt_TheGroveatShrewsburyEastMember_124CC6292A0DF9E46DF4CE3135CCE470" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_TheGroveatShrewsburyWestMember" xlink:label="loc_frt_TheGroveatShrewsburyWestMember_8392C2150E4A78DA4012CE3135CC5B86" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4AF9AF202E198294BE87CE3135CCFBF6" xlink:to="loc_frt_TheGroveatShrewsburyWestMember_8392C2150E4A78DA4012CE3135CC5B86" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_7E380C4A809B139D2039CE3135CC0819" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_F1CFE002EFF48664E02ECE3135CB63DC" xlink:to="loc_us-gaap_DebtInstrumentAxis_7E380C4A809B139D2039CE3135CC0819" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_CBA5EBB87CEC59DF617FCE3135CCB755_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7E380C4A809B139D2039CE3135CC0819" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_CBA5EBB87CEC59DF617FCE3135CCB755_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_CBA5EBB87CEC59DF617FCE3135CCB755" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7E380C4A809B139D2039CE3135CC0819" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_CBA5EBB87CEC59DF617FCE3135CCB755" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_GroveatShrewsburyBrook35Member" xlink:label="loc_frt_GroveatShrewsburyBrook35Member_3B061EB73BFFDCF2335ECE3135CCBE2E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_CBA5EBB87CEC59DF617FCE3135CCB755" xlink:to="loc_frt_GroveatShrewsburyBrook35Member_3B061EB73BFFDCF2335ECE3135CCBE2E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_54B6175C0F9AC4DF82C5CE3135CC73B6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_54B6175C0F9AC4DF82C5CE3135CC73B6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_236FD3D21949C4EE111CCE3135CD861D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_236FD3D21949C4EE111CCE3135CD861D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaap_DebtInstrumentFairValue_4E78479707CBBAE908E1CE3135CD3987" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_DebtInstrumentFairValue_4E78479707CBBAE908E1CE3135CD3987" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1C5D1CE921F6CD214C22CE3135CDC18E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1C5D1CE921F6CD214C22CE3135CDC18E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C1FD48B18CE57C821B98CE3135CD789E" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_C1FD48B18CE57C821B98CE3135CD789E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAverageOutstandingAmount" xlink:label="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_F2F74153059AAD8409CFCE3135CDDE8A" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_F2F74153059AAD8409CFCE3135CDDE8A" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees" xlink:label="loc_frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees_3DCC37D542330486F387CE3135CDA1AB" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_frt_LineofcreditfacilityweightedaverageinterestratebeforeamortizationofdebtFees_3DCC37D542330486F387CE3135CDA1AB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_D8AD6BA262F410C80684CE3135CD1A8F" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_9F2F0D3362973065506DCE3135CCC5CE" xlink:to="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_D8AD6BA262F410C80684CE3135CD1A8F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/DebtTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/DiscontinuedOperations" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/DiscontinuedOperationsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/DiscontinuedOperationsTables" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_19B51E0E318F1FD4AA6C61B0CFEB2FC7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_A1CD52727CEFEBBBC36061B0CFEBA5C4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_19B51E0E318F1FD4AA6C61B0CFEB2FC7" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_A1CD52727CEFEBBBC36061B0CFEBA5C4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_B8D5F533723EABA3DFAE61B0CFEBD26B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_A1CD52727CEFEBBBC36061B0CFEBA5C4" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_B8D5F533723EABA3DFAE61B0CFEBD26B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_65A22DA36F68B448CECB61B0CFEBC772_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_B8D5F533723EABA3DFAE61B0CFEBD26B" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_65A22DA36F68B448CECB61B0CFEBC772_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_65A22DA36F68B448CECB61B0CFEBC772" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_B8D5F533723EABA3DFAE61B0CFEBD26B" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_65A22DA36F68B448CECB61B0CFEBC772" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ScheduleOfDiscontinuedOperationsFinancialInformationTableTextBlock" xlink:label="loc_frt_ScheduleOfDiscontinuedOperationsFinancialInformationTableTextBlock_BC5DB32DE04501F99B4861B0CFEBD70C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_19B51E0E318F1FD4AA6C61B0CFEB2FC7" xlink:to="loc_frt_ScheduleOfDiscontinuedOperationsFinancialInformationTableTextBlock_BC5DB32DE04501F99B4861B0CFEBD70C" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/DocumentAndEntityInformationDocument" xlink:type="extended">
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityInformationLineItems" xlink:label="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntitiesTable" xlink:label="loc_dei_EntitiesTable_B06D45596423A0E70FA961B0CFA3141A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntitiesTable_B06D45596423A0E70FA961B0CFA3141A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_E3E72E7F105C21EC467661B0CFA391B8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_B06D45596423A0E70FA961B0CFA3141A" xlink:to="loc_dei_LegalEntityAxis_E3E72E7F105C21EC467661B0CFA391B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_13B09C5F825796CF096A61B0CFA374A6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_E3E72E7F105C21EC467661B0CFA391B8" xlink:to="loc_dei_EntityDomain_13B09C5F825796CF096A61B0CFA374A6_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_13B09C5F825796CF096A61B0CFA374A6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_E3E72E7F105C21EC467661B0CFA391B8" xlink:to="loc_dei_EntityDomain_13B09C5F825796CF096A61B0CFA374A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_79D65A7645BD09831C2661B0CFA320A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntityRegistrantName_79D65A7645BD09831C2661B0CFA320A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_D4B7F50631DB6A0F48E661B0CFA398DF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntityCentralIndexKey_D4B7F50631DB6A0F48E661B0CFA398DF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_68D6FCB1D543871CB96561B0CFA3DF21" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_CurrentFiscalYearEndDate_68D6FCB1D543871CB96561B0CFA3DF21" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_0441C22D80FFF95C0CD561B0CFA3E84E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntityFilerCategory_0441C22D80FFF95C0CD561B0CFA3E84E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_2EADBCD5D54FC2B56E4D61B0CFA37011" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_DocumentType_2EADBCD5D54FC2B56E4D61B0CFA37011" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_C5FF02FB2035ED2F94F061B0CFA3AF79" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_DocumentPeriodEndDate_C5FF02FB2035ED2F94F061B0CFA3AF79" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_21376793610D58FFE76061B0CFA34168" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_DocumentFiscalYearFocus_21376793610D58FFE76061B0CFA34168" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_CAC3536AC78865EF039861B0CFA3183C" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_DocumentFiscalPeriodFocus_CAC3536AC78865EF039861B0CFA3183C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_239E2CB80B59ECBD7ED661B0CFA30145" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_AmendmentFlag_239E2CB80B59ECBD7ED661B0CFA30145" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_6FE8B4B576131B9DEE0761B0CFA5D4D6" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_TradingSymbol_6FE8B4B576131B9DEE0761B0CFA5D4D6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_DCC4718A3523E4A1672A61B0CFA50AD0" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_DCC4718A3523E4A1672A61B0CFA50AD0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_5B4C5768D470BE2F42DC61B0CFA5E5E1" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_5B4C5768D470BE2F42DC61B0CFA5E5E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_BB164D0C251FAA16960061B0CFA5503F" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntityVoluntaryFilers_BB164D0C251FAA16960061B0CFA5503F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_D5C2C033AAE0C8C62EC361B0CFA5EB0E" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_552C48B228CFF23F6FBF61B0CFA3BF6D" xlink:to="loc_dei_EntityCurrentReportingStatus_D5C2C033AAE0C8C62EC361B0CFA5EB0E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/EarningsPerShare" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended">
    <loc xlink:href="frt-20140331.xsd#frt_EarningsPerShareNarrativeLineItems" xlink:label="loc_frt_EarningsPerShareNarrativeLineItems_2EB60665352C0309E48B61B0CF8E7135" xlink:type="locator" />
    <loc xlink:href="frt-20140331.xsd#frt_EarningsPerShareNarrativeTable" xlink:label="loc_frt_EarningsPerShareNarrativeTable_97B5B9E9783B96E183C861B0CF8E97BE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_2EB60665352C0309E48B61B0CF8E7135" xlink:to="loc_frt_EarningsPerShareNarrativeTable_97B5B9E9783B96E183C861B0CF8E97BE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1F3900AC7F1418D11CFD61B0CF8E57A9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_EarningsPerShareNarrativeTable_97B5B9E9783B96E183C861B0CF8E97BE" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1F3900AC7F1418D11CFD61B0CF8E57A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_980D1D5E2F4322BFC43461B0CF8E5B5A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1F3900AC7F1418D11CFD61B0CF8E57A9" xlink:to="loc_us-gaap_ClassOfStockDomain_980D1D5E2F4322BFC43461B0CF8E5B5A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_980D1D5E2F4322BFC43461B0CF8E5B5A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1F3900AC7F1418D11CFD61B0CF8E57A9" xlink:to="loc_us-gaap_ClassOfStockDomain_980D1D5E2F4322BFC43461B0CF8E5B5A" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_56115A0C0EB9E90D0A5061B0CF8E6CA6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_980D1D5E2F4322BFC43461B0CF8E5B5A" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_56115A0C0EB9E90D0A5061B0CF8E6CA6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_74EBD151ECCEC4B237FA61B0CF8E4436" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_EarningsPerShareNarrativeTable_97B5B9E9783B96E183C861B0CF8E97BE" xlink:to="loc_us-gaap_RangeAxis_74EBD151ECCEC4B237FA61B0CF8E4436" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_EB49FE985ACB9E49C3BB61B0CF8EF35C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_74EBD151ECCEC4B237FA61B0CF8E4436" xlink:to="loc_us-gaap_RangeMember_EB49FE985ACB9E49C3BB61B0CF8EF35C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_EB49FE985ACB9E49C3BB61B0CF8EF35C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_74EBD151ECCEC4B237FA61B0CF8E4436" xlink:to="loc_us-gaap_RangeMember_EB49FE985ACB9E49C3BB61B0CF8EF35C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights_5F45952256105D5BC0BC61B0CF8E53A6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_2EB60665352C0309E48B61B0CF8E7135" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights_5F45952256105D5BC0BC61B0CF8E53A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0AAFC5C3E8CF1069F43561B0CF8E0036" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_2EB60665352C0309E48B61B0CF8E7135" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0AAFC5C3E8CF1069F43561B0CF8E0036" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_B4284961E8FECE6F4C4361B0CF8E9E96" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_EarningsPerShareNarrativeLineItems_2EB60665352C0309E48B61B0CF8E7135" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_B4284961E8FECE6F4C4361B0CF8E9E96" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/EarningsPerShareScheduleOfEarningsPerShareDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_CB087B00BFDBB9272616B997CADB7417" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_F6FD0627465C2ACD88D9B997CADB8E75" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_CB087B00BFDBB9272616B997CADB7417" xlink:to="loc_us-gaap_StatementTable_F6FD0627465C2ACD88D9B997CADB8E75" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_AA634579C39D05F4EBEFB997CADB5E42" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_F6FD0627465C2ACD88D9B997CADB8E75" xlink:to="loc_us-gaap_StatementClassOfStockAxis_AA634579C39D05F4EBEFB997CADB5E42" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1891B4A27B71A4F53ECFB997CADB5284_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_AA634579C39D05F4EBEFB997CADB5E42" xlink:to="loc_us-gaap_ClassOfStockDomain_1891B4A27B71A4F53ECFB997CADB5284_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_1891B4A27B71A4F53ECFB997CADB5284" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_AA634579C39D05F4EBEFB997CADB5E42" xlink:to="loc_us-gaap_ClassOfStockDomain_1891B4A27B71A4F53ECFB997CADB5284" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/EarningsPerShareTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/FairValueOfFinancialInstruments" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsSummaryOfCarryingAmountAndFairValueOfFinancialInstrumentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_5ED2AE0E22A5D49A1B53CE3135C15352" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:to="loc_us-gaap_DebtInstrumentAxis_5ED2AE0E22A5D49A1B53CE3135C15352" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_41A3DE71CA5B50C23B85CE3135C15368_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_5ED2AE0E22A5D49A1B53CE3135C15352" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_41A3DE71CA5B50C23B85CE3135C15368_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_41A3DE71CA5B50C23B85CE3135C15368" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_5ED2AE0E22A5D49A1B53CE3135C15352" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_41A3DE71CA5B50C23B85CE3135C15368" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_TermLoanMember" xlink:label="loc_frt_TermLoanMember_8568FF302D1E26D01A6DCE3135C1E1D2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_41A3DE71CA5B50C23B85CE3135C15368" xlink:to="loc_frt_TermLoanMember_8568FF302D1E26D01A6DCE3135C1E1D2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6A4417540BDC47A72201CE3135C1F1F3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6A4417540BDC47A72201CE3135C1F1F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_07B23AE462C412B86BF4CE3135C15A3D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6A4417540BDC47A72201CE3135C1F1F3" xlink:to="loc_us-gaap_EquityComponentDomain_07B23AE462C412B86BF4CE3135C15A3D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_07B23AE462C412B86BF4CE3135C15A3D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6A4417540BDC47A72201CE3135C1F1F3" xlink:to="loc_us-gaap_EquityComponentDomain_07B23AE462C412B86BF4CE3135C15A3D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_BC9A037E936466ED0D5BCE3135C1BBD8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_07B23AE462C412B86BF4CE3135C15A3D" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_BC9A037E936466ED0D5BCE3135C1BBD8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeByNatureAxis" xlink:label="loc_us-gaap_DerivativeByNatureAxis_490FF4F5739C0B88CEE4CE3135C1048C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:to="loc_us-gaap_DerivativeByNatureAxis_490FF4F5739C0B88CEE4CE3135C1048C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_F015785DFEBD4A300640CE3135C1E12E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeByNatureAxis_490FF4F5739C0B88CEE4CE3135C1048C" xlink:to="loc_us-gaap_DerivativeNameDomain_F015785DFEBD4A300640CE3135C1E12E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="loc_us-gaap_DerivativeNameDomain_F015785DFEBD4A300640CE3135C1E12E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeByNatureAxis_490FF4F5739C0B88CEE4CE3135C1048C" xlink:to="loc_us-gaap_DerivativeNameDomain_F015785DFEBD4A300640CE3135C1E12E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_C55D44D8AD15FD3B0628CE3135C1248C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeNameDomain_F015785DFEBD4A300640CE3135C1E12E" xlink:to="loc_us-gaap_InterestRateSwapMember_C55D44D8AD15FD3B0628CE3135C1248C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_46FECFB6E9E685DA9482CE3135C17FA5" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_46FECFB6E9E685DA9482CE3135C17FA5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9D5D4EB14D98D368C6D9CE3135C228EE_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_46FECFB6E9E685DA9482CE3135C17FA5" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9D5D4EB14D98D368C6D9CE3135C228EE_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9D5D4EB14D98D368C6D9CE3135C228EE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_46FECFB6E9E685DA9482CE3135C17FA5" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9D5D4EB14D98D368C6D9CE3135C228EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_62CB657AE13F3BE506E3CE3135C274EF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_9D5D4EB14D98D368C6D9CE3135C228EE" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_62CB657AE13F3BE506E3CE3135C274EF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EE67553E83774FE67AC3CE3135C21E25" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EE67553E83774FE67AC3CE3135C21E25" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CA8BE72F50B3EDD67FD0CE3135C21BF1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EE67553E83774FE67AC3CE3135C21E25" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CA8BE72F50B3EDD67FD0CE3135C21BF1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CA8BE72F50B3EDD67FD0CE3135C21BF1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_EE67553E83774FE67AC3CE3135C21E25" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CA8BE72F50B3EDD67FD0CE3135C21BF1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_3EE105CEE655243C95D5CE3135C2867F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CA8BE72F50B3EDD67FD0CE3135C21BF1" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_3EE105CEE655243C95D5CE3135C2867F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_C17C6907B328AF7ABA31CE3135C2220E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_8F7BB0A05045BEB9447DCE3135C1CCDF" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_C17C6907B328AF7ABA31CE3135C2220E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_79F82F049CCF772CBEFBCE3135C20B86_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_C17C6907B328AF7ABA31CE3135C2220E" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_79F82F049CCF772CBEFBCE3135C20B86_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_79F82F049CCF772CBEFBCE3135C20B86" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_C17C6907B328AF7ABA31CE3135C2220E" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_79F82F049CCF772CBEFBCE3135C20B86" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_6EC70DA7A3C43C0751A3CE3135C2D4FD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_79F82F049CCF772CBEFBCE3135C20B86" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_6EC70DA7A3C43C0751A3CE3135C2D4FD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_FEA93793AF85C7B512C7CE3135C26530" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_79F82F049CCF772CBEFBCE3135C20B86" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_FEA93793AF85C7B512C7CE3135C26530" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_MortgagesAndNotesPayable" xlink:label="loc_frt_MortgagesAndNotesPayable_3EF856CDE276DF2D222BCE3135C25135" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_frt_MortgagesAndNotesPayable_3EF856CDE276DF2D222BCE3135C25135" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SeniorNotes" xlink:label="loc_us-gaap_SeniorNotes_3E4AE0599024D2E8FD07CE3135C297E4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_SeniorNotes_3E4AE0599024D2E8FD07CE3135C297E4" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_MortgagesAndNotesPayableFairValueDisclosure" xlink:label="loc_frt_MortgagesAndNotesPayableFairValueDisclosure_65B5EE2DDAF7FC99D8F0CE3135C21BA3" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_frt_MortgagesAndNotesPayableFairValueDisclosure_65B5EE2DDAF7FC99D8F0CE3135C21BA3" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_SeniorNotesAndDebenturesFairValueDisclosure" xlink:label="loc_frt_SeniorNotesAndDebenturesFairValueDisclosure_67C0BC581B292C02F0FFCE3135C27A40" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_frt_SeniorNotesAndDebenturesFairValueDisclosure_67C0BC581B292C02F0FFCE3135C27A40" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfInterestRateDerivativesHeld" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_5B862250E1F6C7471849CE3135C27871" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_5B862250E1F6C7471849CE3135C27871" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeLiabilityNotionalAmount" xlink:label="loc_us-gaap_DerivativeLiabilityNotionalAmount_BB29B44D2B10B5D48146CE3135C29EB7" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_DerivativeLiabilityNotionalAmount_BB29B44D2B10B5D48146CE3135C29EB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NotesPayable" xlink:label="loc_us-gaap_NotesPayable_3BBE690F943AB63785A2CE3135C2BEF7" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_NotesPayable_3BBE690F943AB63785A2CE3135C2BEF7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeFixedInterestRate" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_0F73B2E415CDE9512399CE3135C340D2" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_0F73B2E415CDE9512399CE3135C340D2" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_Totalfixedinterestrateduringswap" xlink:label="loc_frt_Totalfixedinterestrateduringswap_AAC5E74126F9B4ABFB96CE3135C36276" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_frt_Totalfixedinterestrateduringswap_AAC5E74126F9B4ABFB96CE3135C36276" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_BD1F4166097FF94F23A6CE3135C33C6B" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_BD1F4166097FF94F23A6CE3135C33C6B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_FE8636B3CC3C75434803CE3135C3677F" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_DerivativeLiabilities_FE8636B3CC3C75434803CE3135C3677F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_87359F8ABAB72CFAF01CCE3135C3B9EC" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_87359F8ABAB72CFAF01CCE3135C3B9EC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_B024616D9247DDED6FFECE3135C253BB" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_F791A77544FB1299D7C9CE3135C23945" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_B024616D9247DDED6FFECE3135C253BB" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/FairValueOfFinancialInstrumentsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/RealEstate" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/RealEstateDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SignificantAcquisitionsAndDisposalsLineItems" xlink:label="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfSignificantAcquisitionsAndDisposalsTable" xlink:label="loc_us-gaap_ScheduleOfSignificantAcquisitionsAndDisposalsTable_8E4388A10CEA58F370CDDBE44C965DBF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_us-gaap_ScheduleOfSignificantAcquisitionsAndDisposalsTable_8E4388A10CEA58F370CDDBE44C965DBF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_92CB3DE160CC195E60DFDBE44C967FB1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSignificantAcquisitionsAndDisposalsTable_8E4388A10CEA58F370CDDBE44C965DBF" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_92CB3DE160CC195E60DFDBE44C967FB1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DBDB7049F7B1991ACF4DBE44C967271_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_92CB3DE160CC195E60DFDBE44C967FB1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DBDB7049F7B1991ACF4DBE44C967271_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DBDB7049F7B1991ACF4DBE44C967271" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_92CB3DE160CC195E60DFDBE44C967FB1" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DBDB7049F7B1991ACF4DBE44C967271" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_GroveatShrewsburyMember" xlink:label="loc_frt_GroveatShrewsburyMember_B2A5F65DB4079A314FA0DBE44C965F4D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DBDB7049F7B1991ACF4DBE44C967271" xlink:to="loc_frt_GroveatShrewsburyMember_B2A5F65DB4079A314FA0DBE44C965F4D" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_Brook35Member" xlink:label="loc_frt_Brook35Member_C01092E685A2BCECD9E7DBE44C9686B4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DBDB7049F7B1991ACF4DBE44C967271" xlink:to="loc_frt_Brook35Member_C01092E685A2BCECD9E7DBE44C9686B4" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_GroveatShrewsburyBrook35Member" xlink:label="loc_frt_GroveatShrewsburyBrook35Member_A3E85E703C945BE1BBEADBE44C96D3FF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6DBDB7049F7B1991ACF4DBE44C967271" xlink:to="loc_frt_GroveatShrewsburyBrook35Member_A3E85E703C945BE1BBEADBE44C96D3FF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AreaOfRealEstateProperty" xlink:label="loc_us-gaap_AreaOfRealEstateProperty_DF83F5A8DD2E31F9426CDBE44C96F35B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_us-gaap_AreaOfRealEstateProperty_DF83F5A8DD2E31F9426CDBE44C96F35B" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_BusinessAcquisitionGrossValue" xlink:label="loc_frt_BusinessAcquisitionGrossValue_4E2F4190F6D7F70BBAB4DBE44C96E696" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_frt_BusinessAcquisitionGrossValue_4E2F4190F6D7F70BBAB4DBE44C96E696" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_EffectiveEconomicInterestAcquisition" xlink:label="loc_frt_EffectiveEconomicInterestAcquisition_A9A4AEDAEE0557B5BF18DBE44C964DB1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_frt_EffectiveEconomicInterestAcquisition_A9A4AEDAEE0557B5BF18DBE44C964DB1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1_0FB5952144B41D331708DBE44C96E5F3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1_0FB5952144B41D331708DBE44C96E5F3" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_NumberofdownREITOperatingPartnershipUnitsIssuedinConnectionwithBusinessAcquisition" xlink:label="loc_frt_NumberofdownREITOperatingPartnershipUnitsIssuedinConnectionwithBusinessAcquisition_7EE001949C5EF34AF738DBE44C9645B2" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_frt_NumberofdownREITOperatingPartnershipUnitsIssuedinConnectionwithBusinessAcquisition_7EE001949C5EF34AF738DBE44C9645B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_574F544988B80DA32AD2DBE44C967FD0" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_574F544988B80DA32AD2DBE44C967FD0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_370F591AF020D8B9F99DDBE44C96DC12" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_370F591AF020D8B9F99DDBE44C96DC12" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_PricetoAcquireNonControllingInterest" xlink:label="loc_frt_PricetoAcquireNonControllingInterest_6C5DF8E8DCC5641CD4C5DBE44C969B76" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SignificantAcquisitionsAndDisposalsLineItems_63B19F98AE34E4568FCBDBE44C96145D" xlink:to="loc_frt_PricetoAcquireNonControllingInterest_6C5DF8E8DCC5641CD4C5DBE44C969B76" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/RealEstatePartnership" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/RealEstatePartnershipNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9C0B169964BD2FFB9BE3CE3135DDC4BE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5A08ADC66BB5A7C9E0F8CE3135DC9487" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9C0B169964BD2FFB9BE3CE3135DDC4BE" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5A08ADC66BB5A7C9E0F8CE3135DC9487" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_3742ECDED2B0584877FFCE3135DD89A5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5A08ADC66BB5A7C9E0F8CE3135DC9487" xlink:to="loc_dei_LegalEntityAxis_3742ECDED2B0584877FFCE3135DD89A5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_87A8387C1591BE1BB592CE3135DD4D32_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_3742ECDED2B0584877FFCE3135DD89A5" xlink:to="loc_dei_EntityDomain_87A8387C1591BE1BB592CE3135DD4D32_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_87A8387C1591BE1BB592CE3135DD4D32" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_3742ECDED2B0584877FFCE3135DD89A5" xlink:to="loc_dei_EntityDomain_87A8387C1591BE1BB592CE3135DD4D32" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_FederalRealtyInvestmentTrustMember" xlink:label="loc_frt_FederalRealtyInvestmentTrustMember_1791F86AF84C00B449E7CE3135DD087A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_87A8387C1591BE1BB592CE3135DD4D32" xlink:to="loc_frt_FederalRealtyInvestmentTrustMember_1791F86AF84C00B449E7CE3135DD087A" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ClarionMember" xlink:label="loc_frt_ClarionMember_559DEE4C1DB8FA0DE25CCE3135DDB493" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_87A8387C1591BE1BB592CE3135DD4D32" xlink:to="loc_frt_ClarionMember_559DEE4C1DB8FA0DE25CCE3135DDB493" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AD065B4A7CB374222A3CCE3135DD97DC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5A08ADC66BB5A7C9E0F8CE3135DC9487" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AD065B4A7CB374222A3CCE3135DD97DC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_FADA76CAA43E4A471B27CE3135DD568A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AD065B4A7CB374222A3CCE3135DD97DC" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_FADA76CAA43E4A471B27CE3135DD568A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_FADA76CAA43E4A471B27CE3135DD568A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_AD065B4A7CB374222A3CCE3135DD97DC" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_FADA76CAA43E4A471B27CE3135DD568A" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_FederalLionVentureLpMember" xlink:label="loc_frt_FederalLionVentureLpMember_86646819F36C77CEB92ACE3135DDE8BF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_FADA76CAA43E4A471B27CE3135DD568A" xlink:to="loc_frt_FederalLionVentureLpMember_86646819F36C77CEB92ACE3135DDE8BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_27C05BEB207C0F7FFD19CE3135DD4399" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9C0B169964BD2FFB9BE3CE3135DDC4BE" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_27C05BEB207C0F7FFD19CE3135DD4399" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="loc_us-gaap_NumberOfRealEstateProperties_51A8CD41D69C7981BC9FCE3135DDF92F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9C0B169964BD2FFB9BE3CE3135DDC4BE" xlink:to="loc_us-gaap_NumberOfRealEstateProperties_51A8CD41D69C7981BC9FCE3135DDF92F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/RealEstatePartnershipSummarizedOperatingResultsAndFinancialPositionOfPartnershipDetails" xlink:type="extended">
    <loc xlink:href="frt-20140331.xsd#frt_RealEstatePartnershipsOperatingResultsLineItems" xlink:label="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_F1C7EBB146412A59AB69CE3135D74A34" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_F1C7EBB146412A59AB69CE3135D74A34" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_AE3015C51683FEE0E06ACE3135D8B29E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_F1C7EBB146412A59AB69CE3135D74A34" xlink:to="loc_us-gaap_DebtInstrumentAxis_AE3015C51683FEE0E06ACE3135D8B29E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2EC2205822570BC071FDCE3135D8805A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_AE3015C51683FEE0E06ACE3135D8B29E" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2EC2205822570BC071FDCE3135D8805A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2EC2205822570BC071FDCE3135D8805A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_AE3015C51683FEE0E06ACE3135D8B29E" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2EC2205822570BC071FDCE3135D8805A" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_TermLoanMember" xlink:label="loc_frt_TermLoanMember_588E8C78512D38AFFB44CE3135D8F24D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2EC2205822570BC071FDCE3135D8805A" xlink:to="loc_frt_TermLoanMember_588E8C78512D38AFFB44CE3135D8F24D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_C879B84330AE18527739CE3135D804BA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_F1C7EBB146412A59AB69CE3135D74A34" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_C879B84330AE18527739CE3135D804BA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_4F54E089721425591738CE3135D89F48_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_C879B84330AE18527739CE3135D804BA" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_4F54E089721425591738CE3135D89F48_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_4F54E089721425591738CE3135D89F48" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_C879B84330AE18527739CE3135D804BA" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_4F54E089721425591738CE3135D89F48" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_FederalLionVentureLpMember" xlink:label="loc_frt_FederalLionVentureLpMember_40458DE5CEAEBFF28B43CE3135D88C08" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_4F54E089721425591738CE3135D89F48" xlink:to="loc_frt_FederalLionVentureLpMember_40458DE5CEAEBFF28B43CE3135D88C08" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_F9BF62E7255709A8BDADCE3135D81E2F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_Revenues_F9BF62E7255709A8BDADCE3135D81E2F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherExpenses" xlink:label="loc_us-gaap_OtherExpenses_23136905C97EBAA99405CE3135D82797" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_OtherExpenses_23136905C97EBAA99405CE3135D82797" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_711B3C33C0E4640AD3ADCE3135D8C72D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_DepreciationAndAmortization_711B3C33C0E4640AD3ADCE3135D8C72D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_796B7ED46CB266E312CDCE3135D8D37F" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_InterestExpense_796B7ED46CB266E312CDCE3135D8D37F" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_TotalExpenses" xlink:label="loc_frt_TotalExpenses_36B72B56F88B545D978ECE3135D8C717" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_frt_TotalExpenses_36B72B56F88B545D978ECE3135D8C717" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_389C5E82368043A474E6CE3135D83D2C" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_ProfitLoss_389C5E82368043A474E6CE3135D83D2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_DE81E598D475068DB56FCE3135D84BB1" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_DE81E598D475068DB56FCE3135D84BB1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RealEstateInvestmentPropertyNet" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyNet_B12DA4563D1C2CDBFDDBCE3135D83959" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_RealEstateInvestmentPropertyNet_B12DA4563D1C2CDBFDDBCE3135D83959" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DB6F37376D6A3B305883CE3135D86AE1" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DB6F37376D6A3B305883CE3135D86AE1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssets" xlink:label="loc_us-gaap_OtherAssets_47FFE02B40C02C0F7C90CE3135D88006" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_OtherAssets_47FFE02B40C02C0F7C90CE3135D88006" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_B5A219114824E47068F4CE3135D8C925" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_Assets_B5A219114824E47068F4CE3135D8C925" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_6A5E465101CB052F3F7CCE3135DA9E7F" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_SecuredDebt_6A5E465101CB052F3F7CCE3135DA9E7F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilities" xlink:label="loc_us-gaap_OtherLiabilities_A94D07D98C691EC940EDCE3135DAB1E8" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_OtherLiabilities_A94D07D98C691EC940EDCE3135DAB1E8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PartnersCapital" xlink:label="loc_us-gaap_PartnersCapital_1B52C67C04C7D12A448ECE3135DA2F75" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_PartnersCapital_1B52C67C04C7D12A448ECE3135DA2F75" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_73CAF00DFAE3FAE5CD88CE3135DAE648" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_73CAF00DFAE3FAE5CD88CE3135DAE648" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_ShareOfUnconsolidatedDebt" xlink:label="loc_frt_ShareOfUnconsolidatedDebt_2668C532ADD0574419B6CE3135DA964E" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_frt_ShareOfUnconsolidatedDebt_2668C532ADD0574419B6CE3135DA964E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures" xlink:label="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_7F66F68BB16BFAA1821FCE3135DAD423" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_RealEstatePartnershipsOperatingResultsLineItems_027832A6C0188BCF38BDCE3135D88168" xlink:to="loc_us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures_7F66F68BB16BFAA1821FCE3135DAD423" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/RealEstatePartnershipTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/RealEstateTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/ShareBasedCompensationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_E878F0AB7FABC0DE269B61B0CF5A3BC5" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_30FBDBA71F6EF4B8445161B0CF583A87" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_E878F0AB7FABC0DE269B61B0CF5A3BC5" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_30FBDBA71F6EF4B8445161B0CF583A87" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_D9DC7EE1F9A25821787461B0CF58AA09" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_30FBDBA71F6EF4B8445161B0CF583A87" xlink:to="loc_us-gaap_AwardTypeAxis_D9DC7EE1F9A25821787461B0CF58AA09" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_47B40641E330BF953B5C61B0CF5A7CEC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_D9DC7EE1F9A25821787461B0CF58AA09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_47B40641E330BF953B5C61B0CF5A7CEC_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_47B40641E330BF953B5C61B0CF5A7CEC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_D9DC7EE1F9A25821787461B0CF58AA09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_47B40641E330BF953B5C61B0CF5A7CEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_DDD1D734F0BE70181B1661B0CF5A3397" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_47B40641E330BF953B5C61B0CF5A7CEC" xlink:to="loc_us-gaap_RestrictedStockMember_DDD1D734F0BE70181B1661B0CF5A3397" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_909942D08C9E306FDF6B61B0CF5A2631" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_47B40641E330BF953B5C61B0CF5A7CEC" xlink:to="loc_us-gaap_EmployeeStockOptionMember_909942D08C9E306FDF6B61B0CF5A2631" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_D02002BDDEA5C7624EC861B0CF5A2229" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_E878F0AB7FABC0DE269B61B0CF5A3BC5" xlink:to="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_D02002BDDEA5C7624EC861B0CF5A2229" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_542323888BAD1E8A379261B0CF5A052C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_D02002BDDEA5C7624EC861B0CF5A2229" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_542323888BAD1E8A379261B0CF5A052C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_2465F98BFE2CB2E6D42161B0CF5A3D94" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_D02002BDDEA5C7624EC861B0CF5A2229" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_2465F98BFE2CB2E6D42161B0CF5A3D94" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_C1069ECB8452FB32808A61B0CF5A1017" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract_D02002BDDEA5C7624EC861B0CF5A2229" xlink:to="loc_us-gaap_ShareBasedCompensation_C1069ECB8452FB32808A61B0CF5A1017" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ShareBasedCompensationPlans" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/ShareBasedCompensationPlansTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/ShareholdersEquity" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/ShareholdersEquityNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:type="locator" />
    <loc xlink:href="frt-20140331.xsd#frt_StockholdersEquityTable" xlink:label="loc_frt_StockholdersEquityTable_9352A38B5AEC0137CB08B8EE78A9D164" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:to="loc_frt_StockholdersEquityTable_9352A38B5AEC0137CB08B8EE78A9D164" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="frt-20140331.xsd#frt_SaleofStockAxis" xlink:label="loc_frt_SaleofStockAxis_B57A4D12EA98A10EB35DB90E43677680" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_StockholdersEquityTable_9352A38B5AEC0137CB08B8EE78A9D164" xlink:to="loc_frt_SaleofStockAxis_B57A4D12EA98A10EB35DB90E43677680" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_SaleofStockDomain" xlink:label="loc_frt_SaleofStockDomain_E42C754919488BBBEF42B90E436720B6_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_SaleofStockAxis_B57A4D12EA98A10EB35DB90E43677680" xlink:to="loc_frt_SaleofStockDomain_E42C754919488BBBEF42B90E436720B6_default" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_SaleofStockDomain" xlink:label="loc_frt_SaleofStockDomain_E42C754919488BBBEF42B90E436720B6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_SaleofStockAxis_B57A4D12EA98A10EB35DB90E43677680" xlink:to="loc_frt_SaleofStockDomain_E42C754919488BBBEF42B90E436720B6" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_AtMarketEquityProgramMember" xlink:label="loc_frt_AtMarketEquityProgramMember_EAED91F690586F90250AB90E817C9488" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_SaleofStockDomain_E42C754919488BBBEF42B90E436720B6" xlink:to="loc_frt_AtMarketEquityProgramMember_EAED91F690586F90250AB90E817C9488" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_StockIssuanceCostsByTypeAxis" xlink:label="loc_frt_StockIssuanceCostsByTypeAxis_D1A91ED58D2503FA20C8B8EE78A9F888" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_StockholdersEquityTable_9352A38B5AEC0137CB08B8EE78A9D164" xlink:to="loc_frt_StockIssuanceCostsByTypeAxis_D1A91ED58D2503FA20C8B8EE78A9F888" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_StockIssuanceCostsByTypeDomain" xlink:label="loc_frt_StockIssuanceCostsByTypeDomain_F32EFA637F4850E4D4E6B8EE78A9B48B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_frt_StockIssuanceCostsByTypeAxis_D1A91ED58D2503FA20C8B8EE78A9F888" xlink:to="loc_frt_StockIssuanceCostsByTypeDomain_F32EFA637F4850E4D4E6B8EE78A9B48B_default" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_StockIssuanceCostsByTypeDomain" xlink:label="loc_frt_StockIssuanceCostsByTypeDomain_F32EFA637F4850E4D4E6B8EE78A9B48B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_frt_StockIssuanceCostsByTypeAxis_D1A91ED58D2503FA20C8B8EE78A9F888" xlink:to="loc_frt_StockIssuanceCostsByTypeDomain_F32EFA637F4850E4D4E6B8EE78A9B48B" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_CommissionsMember" xlink:label="loc_frt_CommissionsMember_4464004A96CCADD5C477B8EE78A97359" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_StockIssuanceCostsByTypeDomain_F32EFA637F4850E4D4E6B8EE78A9B48B" xlink:to="loc_frt_CommissionsMember_4464004A96CCADD5C477B8EE78A97359" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_OtherOfferingCostsMember" xlink:label="loc_frt_OtherOfferingCostsMember_A91872346C617F466A53B8EE78A9AD97" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_StockIssuanceCostsByTypeDomain_F32EFA637F4850E4D4E6B8EE78A9B48B" xlink:to="loc_frt_OtherOfferingCostsMember_A91872346C617F466A53B8EE78A9AD97" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_9004C5478E566EDD1576B8EE78A9829B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_StockholdersEquityTable_9352A38B5AEC0137CB08B8EE78A9D164" xlink:to="loc_us-gaap_StatementClassOfStockAxis_9004C5478E566EDD1576B8EE78A9829B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_CB8AA4A59B50A1955170B8EE78A9E7A0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9004C5478E566EDD1576B8EE78A9829B" xlink:to="loc_us-gaap_ClassOfStockDomain_CB8AA4A59B50A1955170B8EE78A9E7A0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_CB8AA4A59B50A1955170B8EE78A9E7A0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9004C5478E566EDD1576B8EE78A9829B" xlink:to="loc_us-gaap_ClassOfStockDomain_CB8AA4A59B50A1955170B8EE78A9E7A0" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_3CD9A4E5FAD4BB6FFAEAB8EE78A92F9A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_CB8AA4A59B50A1955170B8EE78A9E7A0" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_3CD9A4E5FAD4BB6FFAEAB8EE78A92F9A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_AD6294FDE10D45B01D6DB8EE78A9CB5C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_CB8AA4A59B50A1955170B8EE78A9E7A0" xlink:to="loc_us-gaap_CommonStockMember_AD6294FDE10D45B01D6DB8EE78A9CB5C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_EE7D739575494CC2E7B8B8EE78A989D0" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_StockholdersEquityTable_9352A38B5AEC0137CB08B8EE78A9D164" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_EE7D739575494CC2E7B8B8EE78A989D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_3468D89D80E62FBCF151B8EE78A995DA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_EE7D739575494CC2E7B8B8EE78A989D0" xlink:to="loc_us-gaap_EquityComponentDomain_3468D89D80E62FBCF151B8EE78A995DA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_3468D89D80E62FBCF151B8EE78A995DA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_EE7D739575494CC2E7B8B8EE78A989D0" xlink:to="loc_us-gaap_EquityComponentDomain_3468D89D80E62FBCF151B8EE78A995DA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_CBCA681D431B9B658268B8EE78A97F38" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3468D89D80E62FBCF151B8EE78A995DA" xlink:to="loc_us-gaap_CommonStockMember_CBCA681D431B9B658268B8EE78A97F38" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_AggregateOfferingPriceOfCommonShare" xlink:label="loc_frt_AggregateOfferingPriceOfCommonShare_21306A32074730FAEB7AB8EE78A9A5D8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:to="loc_frt_AggregateOfferingPriceOfCommonShare_21306A32074730FAEB7AB8EE78A9A5D8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_5C4BB9F5001FF9A84924B8EE78A9F120" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_5C4BB9F5001FF9A84924B8EE78A9F120" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_WeightedAveragePricePerCommonShare" xlink:label="loc_frt_WeightedAveragePricePerCommonShare_E8DEABF2AD5D5629DD5BB8EE78A914BE" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:to="loc_frt_WeightedAveragePricePerCommonShare_E8DEABF2AD5D5629DD5BB8EE78A914BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_F152654140DBC8647D42B8EE78A9E6E1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_F152654140DBC8647D42B8EE78A9E6E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsOfStockIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_55AD79CAD85AE23D14A9B8EE78A93518" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_55AD79CAD85AE23D14A9B8EE78A93518" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_RemainingCapacityToIssue" xlink:label="loc_frt_RemainingCapacityToIssue_B936D7E886CB23824A45B8EE78A95840" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_EC6C0058D01B9D87999DB8EE78A9B926" xlink:to="loc_frt_RemainingCapacityToIssue_B936D7E886CB23824A45B8EE78A95840" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ShareholdersEquityShareholdersEquitySummaryOfDividendsDetails" xlink:type="extended">
    <loc xlink:href="frt-20140331.xsd#frt_DividendsLineItems" xlink:label="loc_frt_DividendsLineItems_4F4EA55F77A0A8C2EB4961B0CFAD97E5" xlink:type="locator" />
    <loc xlink:href="frt-20140331.xsd#frt_DividendsTable" xlink:label="loc_frt_DividendsTable_B2D5D79962BFD7ABA58561B0CFAD2C80" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_frt_DividendsLineItems_4F4EA55F77A0A8C2EB4961B0CFAD97E5" xlink:to="loc_frt_DividendsTable_B2D5D79962BFD7ABA58561B0CFAD2C80" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_EA30A65D9C5E61B801BF61B0CFAD0521" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_frt_DividendsTable_B2D5D79962BFD7ABA58561B0CFAD2C80" xlink:to="loc_us-gaap_StatementClassOfStockAxis_EA30A65D9C5E61B801BF61B0CFAD0521" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_A10E6E46A0A60527D76961B0CFADEBE4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_EA30A65D9C5E61B801BF61B0CFAD0521" xlink:to="loc_us-gaap_ClassOfStockDomain_A10E6E46A0A60527D76961B0CFADEBE4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_A10E6E46A0A60527D76961B0CFADEBE4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_EA30A65D9C5E61B801BF61B0CFAD0521" xlink:to="loc_us-gaap_ClassOfStockDomain_A10E6E46A0A60527D76961B0CFADEBE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_6F858E4DE4CFC6424A3C61B0CFAD3F6E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_A10E6E46A0A60527D76961B0CFADEBE4" xlink:to="loc_us-gaap_CommonStockMember_6F858E4DE4CFC6424A3C61B0CFAD3F6E" xlink:type="arc" />
    <loc xlink:href="frt-20140331.xsd#frt_A5417Series1CumulativeConvertiblePreferredMember" xlink:label="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_10C1D605A57CC84C0BC261B0CFAD40B7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_A10E6E46A0A60527D76961B0CFADEBE4" xlink:to="loc_frt_A5417Series1CumulativeConvertiblePreferredMember_10C1D605A57CC84C0BC261B0CFAD40B7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_DD0E78DA89102A515F7A61B0CFAD66AF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_DividendsLineItems_4F4EA55F77A0A8C2EB4961B0CFAD97E5" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_DD0E78DA89102A515F7A61B0CFAD66AF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_714083EB2A55D2CA42AF61B0CFAD0D30" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_DividendsLineItems_4F4EA55F77A0A8C2EB4961B0CFAD97E5" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_714083EB2A55D2CA42AF61B0CFAD0D30" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_35B819E28BAE91B8588561B0CFADAB74" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_DividendsLineItems_4F4EA55F77A0A8C2EB4961B0CFAD97E5" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_35B819E28BAE91B8588561B0CFADAB74" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareDeclared_A1D68742260BDBBEA53461B0CFADCBA7" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_DividendsLineItems_4F4EA55F77A0A8C2EB4961B0CFAD97E5" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareDeclared_A1D68742260BDBBEA53461B0CFADCBA7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PreferredStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_06D4BD9D78DB985FD33E61B0CFADA033" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_frt_DividendsLineItems_4F4EA55F77A0A8C2EB4961B0CFAD97E5" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_06D4BD9D78DB985FD33E61B0CFADA033" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.federalrealty.com/role/ShareholdersEquityTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesPolicy" xlink:type="extended" />
  <definitionLink xlink:role="http://www.federalrealty.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
</linkbase>
