Triennial

//tɹaɪˈɛniəl// adj, noun

adj, noun ·Moderate ·College level

Definitions

Noun
  1. 1
    A third anniversary.
  2. 2
    the 300th anniversary (or the celebration of it) wordnet
  3. 3
    A plant that requires three years to complete its life-cycle.
Adjective
  1. 1
    Happening every three years. not-comparable

    "triennial elections"

  2. 2
    Lasting for three years. not-comparable

    "triennial parliaments; a triennial reign"

Adjective
  1. 1
    occurring every third year or lasting 3 years wordnet

Synonyms

All synonyms
tercentennialamphibianangiospermanniversaryannualannual holiday

Example

More examples

"They were constantly summoned to a triennial festival : and the most approved songs delivered at this assembly were ordered to be preserved in the custody of the king's historian or antiquary"

Etymology

From Latin triennium (“three-year period”), from tres (“three”) + annus (“year”). By surface analysis, tri- + -ennial.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.