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triannual

[trahy-an-yoo-uh l]
adjective
  1. done, occurring, issued, etc., three times a year.
  2. triennial.
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noun
  1. a triannual publication, contest, etc.
  2. triennial.
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Origin of triannual

First recorded in 1630–40; tri- + annual
Related formstri·an·nu·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for triannual

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper