tercentenary
Word family adjectivetercentenarytercentennial
ter·cen·te·na·ry /ˌtɜːsenˈtiːnəri $ ˌtɜːrsenˈtenəri, tɜːrˈsentəneri/ noun (plural tercentenaries) [countableC] British EnglishBrE TMCthe day or year exactly 300 years after a particular event 三百周年纪念(日) Origin tercentenary (1800-1900) Latin ter “three times” + English centenary