triennium

[ trahy-en-ee-uhm ]
/ traɪˈɛn i əm /

noun, plural tri·en·ni·ums, tri·en·ni·a [trahy-en-ee-uh]. /traɪˈɛn i ə/.

a period of three years.

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Origin of triennium

1840–50; <Latin: period of three years, equivalent to trienn(is) pertaining to three years (tri-tri- + -enn-, combining form of annus year + -is adj. suffix) + -ium-ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for triennium

British Dictionary definitions for triennium

triennium
/ (traɪˈɛnɪəm) /

noun plural -niums or -nia (-nɪə)

a period or cycle of three years

Word Origin for triennium

C19: from Latin, from tri- + annus a year
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012