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triennium

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noun, tri·en·ni·um \trī-ˈe-nē-əm\

Definition of triennium

plural trienniums or -nia \-nē-ə\

  1. :  a period of three years



Origin of triennium

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


First Known Use: 1847

Rhymes with triennium


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