triennium

noun
tri·​en·​ni·​um | \trī-ˈe-nē-əm \
plural trienniums or triennia\trī-​ˈe-​nē-​ə \

Definition of triennium 

: a period of three years

First Known Use of triennium

1847, in the meaning defined above

History and Etymology for triennium

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

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Dictionary Entries near triennium

tried-and-true

triene

triennial

triennium

triens

Trientalis

trier

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Time Traveler for triennium

The first known use of triennium was in 1847

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