noun, plural trienniums, triennia [trahy-en-ee-uh] .
a period of three years.

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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
triennium (traɪˈɛnɪəm)
n , pl -niums, -nia
a period or cycle of three years
[C19: from Latin, from tri- + annus a year]

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