noun, plural bi·en·ni·ums, bi·en·ni·a [bahy-en-ee-uh] /baɪˈɛn i ə/.
a period of two years.
Origin of biennium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for biennium
Historical Examples of biennium
This has been used and the library has therefore had this biennium, $9,000 a year.
Online Etymology Dictionary, © 2010 Douglas Harper