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triennial

PRIMARY MEANINGS OF: triennial

1
adj
occurring every third year or lasting 3 years
2
n
the 300th anniversary (or the celebration of it)
FULL DEFINITIONS OF: triennial
1

adj occurring every third year or lasting 3 years

Synonyms
periodic, periodical
happening or recurring at regular intervals
2

n the 300th anniversary (or the celebration of it)

Synonyms:
tercentenary, tercentennial
Type of:
anniversary, day of remembrance
the date on which an event occurred in some previous year (or the celebration of it)
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