biennium

play
noun bi·en·ni·um \bī-ˈe-nē-əm\

Definition of biennium

plural

bienniums

or

biennia

play \-nē-ə\
  1. :  a period of two years

Origin and Etymology of biennium

Latin, from bi- + annus year — more at annual


First Known Use: 1699

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feeling or affected by lethargy

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