TRIENNIAL

triennial

(adjective) occurring every third year or lasting 3 years

tercentennial, tercentenary, triennial

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

Source: WordNet® 3.1

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Etymology

Adjective

triennial (not comparable)

Happening every three years.

Lasting for three years.

Synonyms

• (rare): trieterical

Noun

triennial (plural triennials)

A third anniversary.

A plant that requires three years to complete its life-cycle.

Source: Wiktionary

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Tri*en"ni*al, a. Etym: [L. triennium the space of three years; tri- (see Tri-) + annus year. See Annual.]

1. Continuing three years; as, triennial parliaments; a triennial reign. Howell.

2. Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation. T. Warton.

Tri*en"ni*al, n.

Definition: Something which takes place or appears once in three years.

Source: Webster’s Unabridged Dictionary 1913 Edition

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