from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Occurring every third year.
  • adj. Lasting three years.
  • n. A third anniversary.
  • n. A ceremony or celebration occurring every three years.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Happening every three years.
  • adj. Lasting for three years.
  • n. A third anniversary.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Continuing three years.
  • adj. Happening, coming about, or appearing once in every three years
  • n. Something which takes place or appears once in three years.

from The Century Dictionary and Cyclopedia

  • Continuing three years: as, triennial parliaments; specifically, of plants, lasting or enduring for three years.
  • Happening every three years.
  • n. A mass performed daily for three years for the soul of a dead person.
  • n. A plant which continues to live for three years.
  • n. Any event, service, ceremony, etc., occurring once in three years; specifically, the third anniversary of an event.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. occurring every third year or lasting 3 years
  • n. the 300th anniversary (or the celebration of it)


from The American Heritage® Dictionary of the English Language, 4th Edition

From Latin triennis, from triennium, triennium; see triennium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin triennium ("three-year period"), from tres ("three") + annus ("year").


  • The Finns won attention with their performances in triennial tests sponsored by the Organization for Economic Cooperation and Development, a group funded by 30 countries that monitors social and economic trends.

    What Makes Finnish Kids So Smart? « Isegoria

  • However, important factors such as triennial property assessments and the homestead property tax cap, which limits taxable AV growth to


  • The Anglican Church of Canada is pleased to announce that for the first time in its 117 year history, General Synod is offering religious based organizations and affiliates the opportunity to support its triennial national convention through a variety of unique sponsorship initiatives.

    The Anglican Church of Canada: filthy capitalist « Anglican Samizdat

  • The triennial Shoebox event marks its 10th exhibition March 1 through April 9 at the University of Hawaiʻi Art Gallery before going on the road.

    Hawaii Capsule – Hal Lum & Shoebox Sculpture

  • Spot foreign-exchange volume world-wide totals about $1.49 trillion a day, according to the Bank for International Settlements latest triennial survey.

    Quieter Trading Tilts Broker Ranks

  • In return, as the licence holder of the Virgin brand, he receives annual or triennial fees that can amount to hundreds of millions over time.

    Virgin brands: What does Richard Branson really own?

  • Not surprisingly, leading companies like Microsoft support a triennial "say on pay" vote, as the law allows.

    'Say on Pay'? Sure, But How Often?

  • A central issue at the triennial general assembly of the U. N.'s International Civil Aviation Organization is European Union efforts to reduce greenhouse emissions from airplanes by including them in its cap-and-trade system.

    EU Transport Official Urges Looser Airline Rules

  • Gammill, we should note, hosted Groening's highly attended talk last weekend as part of Ohio State University's triennial Festival of Cartoon Art. "After our talk on Saturday night, we were rushed out of the auditorium and into a car that zoomed away," Gammill tells us.

    VIDEO OF THE DAY: Matt Groening allows Tom Gammill into his creative lair

  • For the New Museum's forthcoming triennial, "The Ungovernables," curator Eungie Joo spent two years visiting studios around the world, meeting artists from Buenos Aires to Hong Kong, Cairo to Harare.

    Local Talent Leads Downtown Triennial


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