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 and Etymology of triennium

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


First Known Use: 1847

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WORD OF THE DAY

a brief usually trivial fact

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