[ trahy-en-ee-uhl ]
/ traɪˈɛn i əl /
occurring every three years.
lasting three years.
a third anniversary.
something that appears or occurs every three years.
a period of three years; triennium.
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OTHER WORDS FROM triennialtri·en·ni·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for triennial
The visits were repeated biennially till 1890, and then triennially.
Some unions meet annually, some biennially, some triennially, and a few determine by referendum when the convention is to meet.The Armies of Labor|Samuel P. Orth
British Dictionary definitions for triennial
/ (traɪˈɛnɪəl) /
relating to, lasting for, or occurring every three years
a third anniversary
a triennial period, thing, or occurrence
Derived forms of triennialtriennially, adverb
Word Origin for triennial
C17: from Latin triennium
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