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triennium

[trahy-en-ee-uh m] /traɪˈɛn i əm/
noun, plural trienniums, triennia
[trahy-en-ee-uh] /traɪˈɛn i ə/ (Show IPA)
1.
a period of three years.
Origin
1840-1850
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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for triennia

triennium

/traɪˈɛnɪəm/
noun (pl) -niums, -nia (-nɪə)
1.
a period or cycle of three years
Word Origin
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
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