Dictionary

tercentenary

noun ter·cen·te·na·ry \ˌtər-(ˌ)sen-ˈte-nə-rē, (ˌ)tər-ˈsen-tə-ˌner-ē\
plural ter·cen·te·na·ries

Definition of TERCENTENARY

:  a 300th anniversary or its celebration
tercentenary adjective
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First Known Use of TERCENTENARY

1855

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