Etymology
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tricentennial (adj.)

also tri-centennial, "comprising three hundred years; including or relating to an interval of three hundred years," 1818; as a noun, "day observed as a festival in commemoration of something that happened three hundred years before," 1872. See tri- + centennial.

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Definitions of tricentennial

tricentennial (adj.)
of or relating to or completing a period of 300 years;
Synonyms: tricentenary
From wordnet.princeton.edu