• synonyms


[trahy-en-ee-uh m]
noun, plural tri·en·ni·ums, tri·en·ni·a [trahy-en-ee-uh] /traɪˈɛn i ə/.
  1. a period of three years.
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Origin of triennium

1840–50; < Latin: period of three years, equivalent to trienn(is) pertaining to three years (tri- tri- + -enn-, combining form of annus year + -is adj. suffix) + -ium -ium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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.

    The Philippine Islands, 1493-1898 - Volume 41 of 55, 1691-1700


  • During the triennium of our father Méntrida, he was visitor and prior of Pasig.

British Dictionary definitions for triennium


noun plural -niums or -nia (-nɪə)
  1. a period or cycle of three years
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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