triennial [trahy-en-ee-uh l] ExamplesWord Origin adjective

  1. occurring every three years.
  2. lasting three years.


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

Origin of triennial First recorded in 1555–65; trienni(um) + -al1 Related formstri·en·ni·al·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 Examples from the Web for triennially Historical Examples of triennially

  • The visits were repeated biennially till 1890, and then triennially.

    Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6


  • 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 triennially triennial adjective

    1. relating to, lasting for, or occurring every three years


    1. a third anniversary
    2. a triennial period, thing, or occurrence

    Derived Formstriennially, adverbWord 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 triennially 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

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