tercentenary
noun
ter·cen·te·na·ry
ˌtər-(ˌ)sen-ˈte-nə-rē
(ˌ)tər-ˈsen-tə-ˌner-ē
plural tercentenaries
: a 300th anniversary or its celebration
tercentenary
adjective
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Merriam-Webster unabridged
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