tercentenary
See tercentenary in American Heritage Dictionary 4
(tûrˌsĕn-tĕnˈə-rē, tər-sĕnˈtə-nĕrˌē)
noun pl. ter·cen·ten·a·ries A 300th anniversary or its celebration.
adjective Of or relating to a span of 300 years or to a 300th anniversary.
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