triennium

From Latin triennium, from triennis (“3-year”) + -ium (suffix forming abstract nouns).

• (General American) IPA^(key): /traɪˈɛniəm/
• (Received Pronunciation) IPA^(key): /trʌɪˈɛnɪəm/

triennium (plural trienniums or triennia)

1. A period of three years.

   Coordinate terms: annum, biennium, quadrennium, quinquennium, sexennium, septennium, octennium, novennium, decennium, vicennium, tricennium, centennium, quincentennium, millennium, decamillennium, centimillennium, millionennium

• See Thesaurus:trio

• (adj.): triennial, triennal, trieterical, trienniated
• (adv.): triennially

• “triennium, n.”, in OED Online ⁠, Oxford: Oxford University Press, 2022.

• nitrenium

• (Classical Latin) IPA^(key): /triˈen.ni.um/, [t̪riˈɛnːiʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /triˈen.ni.um/, [t̪riˈɛnːium]

triennium n (genitive trienniī or triennī); second declension

1. triennium

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).

• triennia

• Catalan: trienni
• English: triennium
• Galician: trienio
• Portuguese: triénio, triênio (Brazil)

• “triennium”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “triennium”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• triennium in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.