<link:linkbase xmlns:link="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" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd http://xbrl.org/2005/xbrldt http://www.xbrl.org/2005/xbrldt-2005.xsd" xmlns:cik0000225604="http://www.MFS.com/20260131">
	<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
	<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
	<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
	<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
	<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
	<link:arcroleRef arcroleURI="http://www.xbrl.org/2009/arcrole/dep-concept-deprecatedConcept" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/arcrole/deprecated-2009-12-16.xsd#dep-concept-deprecatedConcept" />
	<link:roleRef roleURI="http://www.MFS.com/20260131/role/RRRiskTable3" xlink:type="simple" xlink:href="c485bpos-20260528.xsd#RRRiskTable3" />
	<link:roleRef roleURI="http://www.MFS.com/20260131/role/RRRiskTable5" xlink:type="simple" xlink:href="c485bpos-20260528.xsd#RRRiskTable5" />
	<link:roleRef roleURI="http://www.MFS.com/20260131/role/RRRiskTable7" xlink:type="simple" xlink:href="c485bpos-20260528.xsd#RRRiskTable7" />
	<link:roleRef roleURI="http://www.MFS.com/20260131/role/RRRiskTable9" xlink:type="simple" xlink:href="c485bpos-20260528.xsd#RRRiskTable9" />
	<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#SeriesOnly" />
	<link:roleRef roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ClassOnly" />
	<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/ShareholderFeesData" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ShareholderFeesData" />
	<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/OperatingExpensesData" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#OperatingExpensesData" />
	<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#PerformanceMeasureOnly" />
	<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/RiskOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#RiskOnly" />
	<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SeriesOnly">
		<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain" xlink:label="EntityDomain" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_S000002428Member" xlink:label="S000002428Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000002428Member" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_S000002427Member" xlink:label="S000002427Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000002427Member" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_S000038262Member" xlink:label="S000038262Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000038262Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_S000002429Member" xlink:label="S000002429Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000002429Member" order="4.0" />
	</link:definitionLink>
	<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly">
		<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_ShareClassDomain" xlink:label="ShareClassDomain" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006484Member" xlink:label="C000006484Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006484Member" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006485Member" xlink:label="C000006485Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006485Member" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006486Member" xlink:label="C000006486Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006486Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006487Member" xlink:label="C000006487Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006487Member" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000064677Member" xlink:label="C000064677Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000064677Member" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000064678Member" xlink:label="C000064678Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000064678Member" order="6.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000064679Member" xlink:label="C000064679Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000064679Member" order="7.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000064680Member" xlink:label="C000064680Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000064680Member" order="8.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000064681Member" xlink:label="C000064681Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000064681Member" order="9.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006471Member" xlink:label="C000006471Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006471Member" order="10.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006476Member" xlink:label="C000006476Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006476Member" order="11.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006477Member" xlink:label="C000006477Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006477Member" order="12.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006478Member" xlink:label="C000006478Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006478Member" order="13.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006480Member" xlink:label="C000006480Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006480Member" order="14.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006482Member" xlink:label="C000006482Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006482Member" order="15.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006483Member" xlink:label="C000006483Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006483Member" order="16.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006472Member" xlink:label="C000006472Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006472Member" order="17.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000116932Member" xlink:label="C000116932Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000116932Member" order="18.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000118060Member" xlink:label="C000118060Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000118060Member" order="19.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006488Member" xlink:label="C000006488Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006488Member" order="20.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006489Member" xlink:label="C000006489Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006489Member" order="21.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000006490Member" xlink:label="C000006490Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000006490Member" order="22.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000103072Member" xlink:label="C000103072Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000103072Member" order="23.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_C000191232Member" xlink:label="C000191232Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000191232Member" order="24.0" />
	</link:definitionLink>
	<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly">
		<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_PerformanceMeasureDomain" xlink:label="PerformanceMeasureDomain" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_BloombergGlobalAggregateIndex31Member" xlink:label="BloombergGlobalAggregateIndex31Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="BloombergGlobalAggregateIndex31Member" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_ICEBofAGlobalHighYield-ConstrainedIndexUSDHedged32Member" xlink:label="ICEBofAGlobalHighYield-ConstrainedIndexUSDHedged32Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="ICEBofAGlobalHighYield-ConstrainedIndexUSDHedged32Member" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_BloombergUSAggregateBondIndex33Member" xlink:label="BloombergUSAggregateBondIndex33Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="BloombergUSAggregateBondIndex33Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_BloombergUSCorporateHigh-Yield2IssuerCappedIndex34Member" xlink:label="BloombergUSCorporateHigh-Yield2IssuerCappedIndex34Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="BloombergUSCorporateHigh-Yield2IssuerCappedIndex34Member" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_BloombergUSAggregateBondIndex35Member" xlink:label="BloombergUSAggregateBondIndex35Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="BloombergUSAggregateBondIndex35Member" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_BloombergUSCorporateHigh-Yield2IssuerCappedIndex36Member" xlink:label="BloombergUSCorporateHigh-Yield2IssuerCappedIndex36Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="BloombergUSCorporateHigh-Yield2IssuerCappedIndex36Member" order="6.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_BloombergMunicipalBondIndex37Member" xlink:label="BloombergMunicipalBondIndex37Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="BloombergMunicipalBondIndex37Member" order="7.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_MFSMunicipalHighIncomeFundBlendedIndex38Member" xlink:label="MFSMunicipalHighIncomeFundBlendedIndex38Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="MFSMunicipalHighIncomeFundBlendedIndex38Member" order="8.0" />
	</link:definitionLink>
	<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/RiskOnly">
		<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AllRisksMember" xlink:label="AllRisksMember" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_PrincipalRisks2Member" xlink:label="PrincipalRisks2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PrincipalRisks2Member" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_InvestmentSelectionRisk2Member" xlink:label="InvestmentSelectionRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InvestmentSelectionRisk2Member" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_DebtMarketRisk2Member" xlink:label="DebtMarketRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="DebtMarketRisk2Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_InterestRateRisk2Member" xlink:label="InterestRateRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InterestRateRisk2Member" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_CreditRisk2Member" xlink:label="CreditRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="CreditRisk2Member" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_ForeignRisk2Member" xlink:label="ForeignRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ForeignRisk2Member" order="6.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_EmergingMarketsRisk2Member" xlink:label="EmergingMarketsRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="EmergingMarketsRisk2Member" order="7.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_CurrencyRisk2Member" xlink:label="CurrencyRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="CurrencyRisk2Member" order="8.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_FocusRisk2Member" xlink:label="FocusRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="FocusRisk2Member" order="9.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_PrepaymentExtensionRisk2Member" xlink:label="PrepaymentExtensionRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PrepaymentExtensionRisk2Member" order="10.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_DerivativesRisk2Member" xlink:label="DerivativesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="DerivativesRisk2Member" order="11.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_LeveragingRisk2Member" xlink:label="LeveragingRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="LeveragingRisk2Member" order="12.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_CounterpartyandThirdPartyRisk2Member" xlink:label="CounterpartyandThirdPartyRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="CounterpartyandThirdPartyRisk2Member" order="13.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_LiquidityRisk2Member" xlink:label="LiquidityRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="LiquidityRisk2Member" order="14.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_LargeShareholderRisk2Member" xlink:label="LargeShareholderRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="LargeShareholderRisk2Member" order="15.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260528.xsd#cik0000225604_MunicipalRisk2Member" xlink:label="MunicipalRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="MunicipalRisk2Member" order="16.0" />
	</link:definitionLink>
</link:linkbase>