biennia

biennium

[bahy-en-ee-uhm]
noun, plural bienniums, biennia [bahy-en-ee-uh] .
a period of two years.

Origin:
1895–1900; < Latin, equivalent to bi- bi-1 + -enn- (combining form of annus year) + -ium -ium

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

biennium
"space of two years," by 1851, from L. biennium, from bi- + annus "year" (see annual).
Online Etymology Dictionary, © 2010 Douglas Harper
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