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Added 9 October 2026

biennial

/baɪˈɛn.i.əl/ adjective

Latin root: bienni Wiktionary

adjective Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about biennial at Wordnik → Where our words come from →

Happening every two years.
Lasting for two years.

noun

A plant that requires two years to complete its life-cycle, germinating and growing in its first year, then producing its flowers and fruit in its second year, after which it usually dies.
An event that happens every two years.

Origin

Borrowed from Latin bienni(um) (“two-year period”) [from bis, bi- (“twice”) + annus (“year”)] + -al (suffix forming adjectives). By surface analysis, bi- + -ennial.

From Wiktionary, via Kaikki.org (CC BY-SA)

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