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

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: periodic, periodical

Type of: flora, plant, plant life

Encyclopedia: Biennial