triennial

[ trahy-en-ee-uh l ]
/ traɪˈɛn i əl /

adjective

occurring every three years.
lasting three years.

noun

a third anniversary.
something that appears or occurs every three years.
a period of three years; triennium.

RELATED WORDS


Nearby words

  1. tried,
  2. tried and true,
  3. tried-and-true,
  4. triella,
  5. triene,
  6. triennium,
  7. triens,
  8. trient,
  9. trientes,
  10. trier

Origin of triennial

First recorded in 1555–65; trienni(um) + -al1

Related formstri·en·ni·al·ly, adverb

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for triennial


British Dictionary definitions for triennial

triennial

/ (traɪˈɛnɪəl) /

adjective

relating to, lasting for, or occurring every three years

noun

a third anniversary
a triennial period, thing, or occurrence
Derived Formstriennially, 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

Word Origin and History for triennial

triennial

adj.

1630s, "lasting three years;" 1640s, "occurring every three years," from Latin triennium "three-year period," from tri- "three" (see tri-) + annus "year" (see annual). For vowel change, see biennial.

Online Etymology Dictionary, © 2010 Douglas Harper