noun, plural tri·en·ni·ums, tri·en·ni·a [trahy-en-ee-uh] /traɪˈɛn i ə/.
a period of three years.
Origin of triennium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for triennium
Historical Examples of triennium
At the completion of his triennium he was chosen president of the Recollect hospitium in Mexico.
During the triennium of our father Méntrida, he was visitor and prior of Pasig.
noun plural -niums or -nia (-nɪə)
a period or cycle of three years
Word Origin for triennium
C19: from Latin, from tri- + annus a year
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012