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biennium

[bahy-en-ee-uh m] /baɪˈɛn i əm/
noun, plural bienniums, biennia
[bahy-en-ee-uh] /baɪˈɛn i ə/ (Show IPA)
1.
a period of two years.
Origin
1895-1900
1895-1900; < Latin, equivalent to bi- bi-1 + -enn- (combining form of annus year) + -ium -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for biennia
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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