Definition of triennium in US English:



  • A specified period of three years.

    • ‘The new International Rules of Yacht Racing, covering the triennium 2001-2004, were implemented for the first time in an Optimist regatta in Asia and the race organizers watched with great interest.’
    • ‘The incoming president for the next triennium will be René Dändliker from Switzerland.’
    • ‘Indeed, he deferred submitting a proposal for renewal of a triennium of funding two years ago while he pulled together a massive restructuring of the organisation.’
    • ‘The representative democracy of our Constitution is not confined to a ceremonial visit of electors to the ballot box each triennium.’
    • ‘In Budget 2003 tertiary education funding rate increases were announced for the 2004/06 triennium.’
    • ‘A Labour-led Government over the next triennium, after this particular Parliament is finished, is essential because the good news in this Budget rolls out over a number of years to come.’
    • ‘We call it vocational registration, and we have to accumulate a minimum number of points over a triennium.’
    • ‘Books published in the triennium 1999 to 2002 will be considered for the Levin award, which will be presented at the ACLA Annual Meeting in San Diego, April 2003.’


Mid 19th century: from Latin, from tri- ‘three’ + annum ‘year’.