tercentenary

noun
🔊/ˌtɜːsenˈtiːnəri/
🔊/ˌtɜːrsenˈtenəri/
(plural tercentenaries)
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  1. the 300th anniversary of something三百周年纪念
    • the tercentenary of the school’s foundation建校三百周年纪念
    • tercentenary celebrations三百周年庆典