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[n] 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
[adj] (botany) having a life cycle lasting two seasons; "a biennial life cycle"; "parsnips and carrots are biennial plants often grown as annuals"
[adj] occurring every second year; "they met at biennial conventions"

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biyearly, two-year