"biennial" in the noun sense
1. biennial
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
"biennial" in the adjective sense
1. biennial, two-year
having a life cycle lasting two seasons
"a biennial life cycle"
"parsnips and carrots are biennial plants often grown as annuals"
2. biennial, biyearly
occurring every second year
"they met at biennial conventions"
Source: WordNet® (An amazing lexical database of English)
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