triennial

triennial

[trahy-en-ee-uhl]
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) + -al1

triennially, adverb
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World English Dictionary
triennial (traɪˈɛnɪəl)
 
adj
1.  relating to, lasting for, or occurring every three years
 
n
2.  a third anniversary
3.  a triennial period, thing, or occurrence
 
[C17: from Latin triennium]
 
tri'ennially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
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, © 2010 Douglas Harper
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