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biennium

[bahy-en-ee-uh m]
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noun, plural bi·en·ni·ums, bi·en·ni·a [bahy-en-ee-uh] /baɪˈɛn i ə/.
  1. a period of two years.
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Origin of biennium

1895–1900; < Latin, equivalent to bi- bi-1 + -enn- (combining form of annus year) + -ium -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for biennium

n.

"space of two years," by 1851, from Latin biennium "two years, a period of two years," from bi- + annus "year" (see annual). For vowel change, see biennial.

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Online Etymology Dictionary, © 2010 Douglas Harper