quincentenary
noun
quin·cen·te·na·ry
ˌkwin-sen-ˈte-nə-rē
-ˈsen-tə-ˌner-ē
especially British -sen-ˈtē-nə-rē
: a 500th anniversary or its celebration
quincentenary
adjective
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Merriam-Webster unabridged
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