Triennial Definition

trī-ĕnē-əl
adjective
Occurring every third year.
American Heritage
Lasting three years.
Webster's New World
noun
A triennial event or occurrence.
Webster's New World

A third anniversary.

Wiktionary
A ceremony or celebration occurring every three years.
American Heritage
Synonyms:

Other Word Forms of Triennial

Noun

Singular:
triennial
Plural:
triennials

Origin of Triennial

  • From Latin triennium (“three-year period"), from tres (“three") + annus (“year").

    From Wiktionary

  • From Latin triennis from triennium triennium triennium

    From American Heritage Dictionary of the English Language, 5th Edition

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