Etymology
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tercentenary (adj.)

1832, "pertaining to a period of 300 years," from ter- "three times" + centenary. As a noun from 1835. Related: Tercentennial (1862 as an adjective; 1872 as a noun).

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Definitions of tercentenary

tercentenary (n.)
the 300th anniversary (or the celebration of it);
Synonyms: tercentennial / triennial
From wordnet.princeton.edu