triennium

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US/traɪˈɛniəm/UK/trʌɪˈɛnɪəm/

noun

A period of three years.

OriginLatin triennium →
UncommonScrabble 11
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Meanings

nountriennium (plural trienniums or triennia)

plural trienniums · plural triennia

  1. A period of three years.

Origin

  1. Latintriennium
  2. Englishtriennium

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

More words from Latin

Full word history & related roots →

Translations

French triennal
  • triennalperiod of three years
German Triennium
  • Trienniumperiod of three years
Italian triennio
  • triennioperiod of three years
Japanese 三年, 三年
  • 三年 (sannen)period of three years
  • 三年 (mitose)period of three years
Latin triennium
  • trienniumperiod of three years
Polish trzylecie
  • trzylecieperiod of three years
Portuguese triénio
  • triénioperiod of three years
Spanish trienio
  • trienioperiod of three years
Swedish treårsperiod
  • treårsperiodperiod of three years
Ukrainian триріччя
  • триріччя (tryriččja)period of three years

Rhymes & wordplay

Anagrams

nitrenium
Cite this entry
APA

triennium. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/triennium

MLA

“triennium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/triennium. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “triennium,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/triennium.

Source: triennium on Wiktionary, CC BY-SA 4.0.