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triennial

 - 3 dictionary results

tri⋅en⋅ni⋅al

  [trahy-en-ee-uhl]
Use triennial in a Sentence
–adjective
1. occurring every three years.
2. lasting three years.
–noun
3. a third anniversary.
4. something that appears or occurs every three years.
5. a period of three years; triennium.
Origin:
1555–65; trienni(um) + -al 1

Related forms:
tri⋅en⋅ni⋅al⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To triennial
tri·en·ni·al   (trī-ěn'ē-əl)   
adj.  

  1. Occurring every third year.

  2. Lasting three years.

n.  

  1. A third anniversary.

  2. A ceremony or celebration occurring every three years.


[From Latin triennis, from triennium, triennium; see triennium.]
tri·en'ni·al·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

triennial 
1640, "lasting three years;" 1642 in the sense of "occurring every three years," from L. triennium "three-year period," from tri- "three" + annus "year" (see annual).
Online Etymology Dictionary, © 2001 Douglas Harper
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