triennial

[ trahy-en-ee-uhl ]
See synonyms for triennial on Thesaurus.com
adjective
  1. occurring every three years.

  2. lasting three years.

noun
  1. a third anniversary.

  2. something that appears or occurs every three years.

  1. a period of three years; triennium.

Origin of triennial

1
First recorded in1555–65; trienni(um) + -al1

Other words from triennial

  • tri·en·ni·al·ly, adverb

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How to use triennial in a sentence

British Dictionary definitions for triennial

triennial

/ (traɪˈɛnɪəl) /


adjective
  1. relating to, lasting for, or occurring every three years

noun
  1. a third anniversary

  2. a triennial period, thing, or occurrence

Origin of triennial

1
C17: from Latin triennium

Derived forms of triennial

  • triennially, adverb

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