First Known Use: 1899
Dictionary
biennium
noun bi·en·ni·um \bī-ˈe-nē-əm\
plural bi·en·ni·ums or -nia \-nē-ə\
Definition of BIENNIUM
: a period of two years
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Origin of BIENNIUM
Latin, from bi- + annus year — more at annual
Rhymes with BIENNIUM
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