Crossword clue: another word for tercentennial
2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
the 300th anniversary (or the celebration of it)
the 300th anniversary (or the celebration of it)
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Including, or relating to, an interval of three hundred years. -- n. The three hundredth anniversary of any event; also, a celebration of such an anniversary.the 300th anniversary (or the celebration of it)occurring every third year or lasting 3 yearsSomething which takes place or appears once in three years.