triannual

triannual

[trahy-an-yoo-uhl]
adjective
1.
done, occurring, issued, etc., three times a year.
noun
3.
a triannual publication, contest, etc.

Origin:
1630–40; tri- + annual

triannually, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  triannual
Part of Speech:  adj
Definition:  occurring every three years; lasting for three years
Etymology:  tri 'three' + annual
Dictionary.com's 21st Century Lexicon
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