having a life cycle lasting two seasons; a biennial life cycle; parsnips and carrots are biennial plants often grown as annuals

[ Syn: two-year , two-year ]

(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

occurring every second year; they met at biennial conventions

[ Syn: biyearly ]