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1. Having a life cycle lasting two seasons
   "a biennial life cycle"; "parsnips and carrots are biennial plants often grown as annuals"
   - two-year
    
2. Occurring every second year
   "they met at biennial conventions"
   - biyearly

1. (botany) a plant having a life cycle that normally takes two seasons from germination to death to complete; flowering biennials usually bloom and fruit in the second season

Derived forms: biennials

See also: biennially, periodic, periodical

Type of: flora, plant, plant life

Antonym: annual, perennial

Encyclopedia: Biennial