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Definition of triennial

triennial

/traɪˈɛn.i.əl/
tri · en · ni · al
Adverb:triennially
•
Plural:triennials
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triennial Lexical Profile

triennial Game Scores & Validity

• adjective

1

Lasting for or occurring every three years.

Example

"The international association holds a triennial conference to review global industry standards."

Antonyms
View all antonyms for triennial

• noun

1

An event, festival, exhibition, or anniversary that takes place every three years, or a period of three years.

Example

"Curators from around the world gathered in Milan for the prestigious architecture and design triennial."

2

A plant that requires three years to complete its biological life cycle before flowering and dying.

Example

"Unlike common garden annuals, this particular woodland species grows as a triennial."

Synonyms
View all synonyms for triennial

• Rhymes for triennial

• Nearby Words

tricyclist
tricyrtis
trident
triennial
triennially
trientalis
trier

Word Origin & Etymology

Borrowed in the early 17th century from Latin triennium ('a period of three years'), formed from tri- ('three') and annus ('year'), modeled on words like biennial and perennial.

Cite this Entry

Wordmom. (2026). Definition of Triennial. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/triennial
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