triennium


tri·en·ni·um

noun \trī-ˈe-nē-əm\
plural tri·en·ni·ums or -nia \-nē-ə\

Definition of TRIENNIUM

:  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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