<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:cik0001469192="http://www.mainstayinvestments.com/20260430">
	<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.mainstayinvestments.com/20260430/role/RRRiskTable3" xlink:type="simple" xlink:href="c485bpos-20260824.xsd#RRRiskTable3" />
	<link:roleRef roleURI="http://www.mainstayinvestments.com/20260430/role/RRRiskTable5" xlink:type="simple" xlink:href="c485bpos-20260824.xsd#RRRiskTable5" />
	<link:roleRef roleURI="http://www.mainstayinvestments.com/20260430/role/RRRiskTable7" xlink:type="simple" xlink:href="c485bpos-20260824.xsd#RRRiskTable7" />
	<link:roleRef roleURI="http://www.mainstayinvestments.com/20260430/role/RRRiskTable9" xlink:type="simple" xlink:href="c485bpos-20260824.xsd#RRRiskTable9" />
	<link:roleRef roleURI="http://www.mainstayinvestments.com/20260430/role/RRRiskTable11" xlink:type="simple" xlink:href="c485bpos-20260824.xsd#RRRiskTable11" />
	<link:roleRef roleURI="http://www.mainstayinvestments.com/20260430/role/RRRiskTable13" xlink:type="simple" xlink:href="c485bpos-20260824.xsd#RRRiskTable13" />
	<link:roleRef roleURI="http://xbrl.sec.gov/rr/role/ProspectusOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#ProspectusOnly" />
	<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/rr/role/ProspectusOnly">
		<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentDomain" xlink:label="DocumentDomain" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000067318SummaryMember" xlink:label="S000067318SummaryMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000067318SummaryMember" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000067319SummaryMember" xlink:label="S000067319SummaryMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000067319SummaryMember" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000067318Summary1Member" xlink:label="S000067318Summary1Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000067318Summary1Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000067319Summary2Member" xlink:label="S000067319Summary2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000067319Summary2Member" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068835SummaryMember" xlink:label="S000068835SummaryMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068835SummaryMember" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068838SummaryMember" xlink:label="S000068838SummaryMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068838SummaryMember" order="6.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068839SummaryMember" xlink:label="S000068839SummaryMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068839SummaryMember" order="7.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068837SummaryMember" xlink:label="S000068837SummaryMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068837SummaryMember" order="8.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068835Summary3Member" xlink:label="S000068835Summary3Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068835Summary3Member" order="9.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068838Summary4Member" xlink:label="S000068838Summary4Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068838Summary4Member" order="10.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068839Summary5Member" xlink:label="S000068839Summary5Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068839Summary5Member" order="11.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068837Summary6Member" xlink:label="S000068837Summary6Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="DocumentDomain" xlink:to="S000068837Summary6Member" order="12.0" />
	</link:definitionLink>
	<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-20260824.xsd#cik0001469192_S000067318Member" xlink:label="S000067318Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000067318Member" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000067319Member" xlink:label="S000067319Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000067319Member" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068835Member" xlink:label="S000068835Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000068835Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068838Member" xlink:label="S000068838Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000068838Member" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068839Member" xlink:label="S000068839Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000068839Member" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_S000068837Member" xlink:label="S000068837Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="EntityDomain" xlink:to="S000068837Member" order="6.0" />
	</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-20260824.xsd#cik0001469192_C000216486Member" xlink:label="C000216486Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216486Member" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216485Member" xlink:label="C000216485Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216485Member" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216482Member" xlink:label="C000216482Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216482Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216483Member" xlink:label="C000216483Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216483Member" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216484Member" xlink:label="C000216484Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216484Member" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216492Member" xlink:label="C000216492Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216492Member" order="6.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216488Member" xlink:label="C000216488Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216488Member" order="7.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216487Member" xlink:label="C000216487Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216487Member" order="8.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216489Member" xlink:label="C000216489Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216489Member" order="9.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000216491Member" xlink:label="C000216491Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000216491Member" order="10.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000219988Member" xlink:label="C000219988Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000219988Member" order="11.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000219986Member" xlink:label="C000219986Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000219986Member" order="12.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000219987Member" xlink:label="C000219987Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000219987Member" order="13.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000219985Member" xlink:label="C000219985Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000219985Member" order="14.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000221684Member" xlink:label="C000221684Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000221684Member" order="15.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220005Member" xlink:label="C000220005Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220005Member" order="16.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220001Member" xlink:label="C000220001Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220001Member" order="17.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220002Member" xlink:label="C000220002Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220002Member" order="18.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220003Member" xlink:label="C000220003Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220003Member" order="19.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000221687Member" xlink:label="C000221687Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000221687Member" order="20.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220007Member" xlink:label="C000220007Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220007Member" order="21.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220008Member" xlink:label="C000220008Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220008Member" order="22.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220010Member" xlink:label="C000220010Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220010Member" order="23.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220011Member" xlink:label="C000220011Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220011Member" order="24.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000221688Member" xlink:label="C000221688Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000221688Member" order="25.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000219998Member" xlink:label="C000219998Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000219998Member" order="26.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000219999Member" xlink:label="C000219999Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000219999Member" order="27.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000220000Member" xlink:label="C000220000Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000220000Member" order="28.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000219997Member" xlink:label="C000219997Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000219997Member" order="29.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_C000221686Member" xlink:label="C000221686Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="ShareClassDomain" xlink:to="C000221686Member" order="30.0" />
	</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-20260824.xsd#cik0001469192_MSCIWorldIndexMember" xlink:label="MSCIWorldIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="MSCIWorldIndexMember" order="1.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_FTSEGlobalCoreInfrastructure5050IndexMember" xlink:label="FTSEGlobalCoreInfrastructure5050IndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="FTSEGlobalCoreInfrastructure5050IndexMember" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_Russell3000IndexMember" xlink:label="Russell3000IndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="Russell3000IndexMember" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_FTSENareitAllEquityREITsIndexMember" xlink:label="FTSENareitAllEquityREITsIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="FTSENareitAllEquityREITsIndexMember" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_CBRERealEstateTieredIndexMember" xlink:label="CBRERealEstateTieredIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="CBRERealEstateTieredIndexMember" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_MSCIUSREITIndexMember" xlink:label="MSCIUSREITIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="MSCIUSREITIndexMember" order="6.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_BloombergUSAggregateBondIndexMember" xlink:label="BloombergUSAggregateBondIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="BloombergUSAggregateBondIndexMember" order="7.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_SP500IndexMember" xlink:label="SP500IndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="SP500IndexMember" order="8.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_MSCIEAFEIndexMember" xlink:label="MSCIEAFEIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="MSCIEAFEIndexMember" order="9.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_ConservativeAllocationCompositeIndexMember" xlink:label="ConservativeAllocationCompositeIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="ConservativeAllocationCompositeIndexMember" order="10.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_ModerateAllocationCompositeIndexMember" xlink:label="ModerateAllocationCompositeIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="ModerateAllocationCompositeIndexMember" order="11.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_GrowthAllocationCompositeIndexMember" xlink:label="GrowthAllocationCompositeIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="GrowthAllocationCompositeIndexMember" order="12.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_EquityAllocationCompositeIndexMember" xlink:label="EquityAllocationCompositeIndexMember" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PerformanceMeasureDomain" xlink:to="EquityAllocationCompositeIndexMember" order="13.0" />
	</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-20260824.xsd#cik0001469192_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-20260824.xsd#cik0001469192_MarketRisk2Member" xlink:label="MarketRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="MarketRisk2Member" order="2.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_PortfolioManagementRisk2Member" xlink:label="PortfolioManagementRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PortfolioManagementRisk2Member" order="3.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_EquitySecuritiesRisk2Member" xlink:label="EquitySecuritiesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="EquitySecuritiesRisk2Member" order="4.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_InfrastructureInvestmentRisk2Member" xlink:label="InfrastructureInvestmentRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InfrastructureInvestmentRisk2Member" order="5.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_RightsandWarrantsRisk2Member" xlink:label="RightsandWarrantsRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="RightsandWarrantsRisk2Member" order="6.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_DepositaryReceiptsRisk2Member" xlink:label="DepositaryReceiptsRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="DepositaryReceiptsRisk2Member" order="7.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_PreferredSharesRisk2Member" xlink:label="PreferredSharesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PreferredSharesRisk2Member" order="8.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_ConvertibleSecuritiesRisk2Member" xlink:label="ConvertibleSecuritiesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ConvertibleSecuritiesRisk2Member" order="9.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_MasterLimitedPartnershipMLPRisk2Member" xlink:label="MasterLimitedPartnershipMLPRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="MasterLimitedPartnershipMLPRisk2Member" order="10.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_ForeignSecuritiesRisk2Member" xlink:label="ForeignSecuritiesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ForeignSecuritiesRisk2Member" order="11.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_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="12.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_InvestmentsinOtherInvestmentCompaniesRisk2Member" xlink:label="InvestmentsinOtherInvestmentCompaniesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InvestmentsinOtherInvestmentCompaniesRisk2Member" order="13.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_Exchange-TradedFundETFRisk2Member" xlink:label="Exchange-TradedFundETFRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="Exchange-TradedFundETFRisk2Member" order="14.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_MarketCapitalizationRisk2Member" xlink:label="MarketCapitalizationRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="MarketCapitalizationRisk2Member" order="15.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_LiquidityandValuationRisk2Member" xlink:label="LiquidityandValuationRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="LiquidityandValuationRisk2Member" order="16.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_ConcentrationRisk2Member" xlink:label="ConcentrationRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ConcentrationRisk2Member" order="17.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_RealEstateInvestmentTrustRisk2Member" xlink:label="RealEstateInvestmentTrustRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="RealEstateInvestmentTrustRisk2Member" order="18.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_RealEstateCompaniesRisk2Member" xlink:label="RealEstateCompaniesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="RealEstateCompaniesRisk2Member" order="19.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_InitialPublicOfferingRisk2Member" xlink:label="InitialPublicOfferingRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="InitialPublicOfferingRisk2Member" order="20.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_PrivatePlacementandRestrictedSecuritiesRisk2Member" xlink:label="PrivatePlacementandRestrictedSecuritiesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PrivatePlacementandRestrictedSecuritiesRisk2Member" order="21.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_GrowthStockRisk2Member" xlink:label="GrowthStockRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="GrowthStockRisk2Member" order="22.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_Non-DiversificationRisk2Member" xlink:label="Non-DiversificationRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="Non-DiversificationRisk2Member" order="23.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_PrincipalRisksoftheFund2Member" xlink:label="PrincipalRisksoftheFund2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PrincipalRisksoftheFund2Member" order="24.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_AssetAllocationRisk2Member" xlink:label="AssetAllocationRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="AssetAllocationRisk2Member" order="25.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_Exchange-TradedFundRisk2Member" xlink:label="Exchange-TradedFundRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="Exchange-TradedFundRisk2Member" order="26.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_FocusedPortfolioRisk2Member" xlink:label="FocusedPortfolioRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="FocusedPortfolioRisk2Member" order="27.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_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="28.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_PassiveManagementRisk2Member" xlink:label="PassiveManagementRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="PassiveManagementRisk2Member" order="29.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_TrackingErrorRisk2Member" xlink:label="TrackingErrorRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="TrackingErrorRisk2Member" order="30.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_IndexRisk2Member" xlink:label="IndexRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="IndexRisk2Member" order="31.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_SecondaryMarketTradingRisk2Member" xlink:label="SecondaryMarketTradingRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="SecondaryMarketTradingRisk2Member" order="32.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_AuthorizedParticipantConcentrationRisk2Member" xlink:label="AuthorizedParticipantConcentrationRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="AuthorizedParticipantConcentrationRisk2Member" order="33.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_DebtSecuritiesRisk2Member" xlink:label="DebtSecuritiesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="DebtSecuritiesRisk2Member" order="34.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_High-YieldSecuritiesRisk2Member" xlink:label="High-YieldSecuritiesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="High-YieldSecuritiesRisk2Member" order="35.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_Mortgage-RelatedandOtherAsset-BackedSecuritiesRisk2Member" xlink:label="Mortgage-RelatedandOtherAsset-BackedSecuritiesRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="Mortgage-RelatedandOtherAsset-BackedSecuritiesRisk2Member" order="36.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_RegulatoryRisk2Member" xlink:label="RegulatoryRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="RegulatoryRisk2Member" order="37.0" />
		<link:loc xlink:type="locator" xlink:href="c485bpos-20260824.xsd#cik0001469192_ValueStockRisk2Member" xlink:label="ValueStockRisk2Member" />
		<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AllRisksMember" xlink:to="ValueStockRisk2Member" order="38.0" />
	</link:definitionLink>
</link:linkbase>