triennium

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

a period of three years.

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
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British Dictionary definitions for triennium

triennium

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