biennium

[bahy-en-ee-uh m]

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

Word Origin and History for biennia

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.

Online Etymology Dictionary, © 2010 Douglas Harper