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quadricentenary
(kwŏdˌrĭ-sĕn-tĕnˈə-rē, -sĕnˈtə-nĕrˌē)
noun pl. quad·ri·cen·ten·a·ries A 400th anniversary or celebration.
adjective Of or relating to a span of 400 years or to a 400th anniversary.