Letterora

Crossword clue: occurring every third year or lasting 3 years

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

triennial 9 letters wn-def

the 300th anniversary (or the celebration of it)

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Similar clues

occurring once every 20 years 50% similar → vicennial
occurring or payable every year 50% similar → yearly

Related clues

Another word for tercentennialSomething which takes place or appears once in three years.