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WordReference Random House Learner's Dictionary of American English © 2024bi•en•ni•al /baɪˈɛniəl/USA pronunciation adj. - happening once every two years: biennial games.
- lasting or enduring for two years: a biennial life cycle.
- Botany(of a plant) blooming and forming seeds in the second year of life.
n. [countable] - an event occurring once in two years.
- Botanya biennial plant.
Also, biyearly (for defs. 1, 2. ). bi•en•ni•al•ly, adv. See -enn-. WordReference Random House Unabridged Dictionary of American English © 2024bi•en•ni•al (bī en′ē əl),USA pronunciation adj. - happening every two years:biennial games.
- lasting or enduring for two years:a biennial life cycle.
- Botanycompleting its normal term of life in two years, flowering and fruiting the second year, as beets or winter wheat.
n. - any event occurring once in two years.
- Botanya biennial plant.
Also, biyearly (for defs. 1, 2). - bienni(um) + -al1 1615–25
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