Main Entry: bi·en·ni·al

Pronunciation: \(ˌ)bī-ˈe-nē-əl\

Function: adjective

Date: 1562

1 : occurring every two years
2 : continuing or lasting for two years; specifically : growing vegetatively during the first year and fruiting and dying during the second

usage see bi-

— biennial noun

— bi·en·ni·al·ly \-ə-lē\ adverb