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triannual

[trahy-an-yoo-uh l] /traɪˈæn yu əl/
adjective
1.
done, occurring, issued, etc., three times a year.
2.
noun
3.
a triannual publication, contest, etc.
4.
Origin
1630-1640
1630-40; tri- + annual
Related forms
triannually, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for triannual
adjective

occurring every three years; lasting for three years

Word Origin

tri 'three' + annual

Dictionary.com's 21st Century Lexicon
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Word Origin and History for triannual
adj.

1630s, from tri- + annual. Related: Triannually.

Online Etymology Dictionary, © 2010 Douglas Harper
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