quadrennium

== English == === Etymology === From Late Latin quadrennium, from Latin quadriennium, from quadriennis (“4-year”) + -ium (suffix forming abstract nouns). === Pronunciation === (General American) IPA(key): /kwɑˈdrɛniəm/ (Received Pronunciation) IPA(key): /kwɒˈdrɛnɪəm/, /kwəˈdrɛnɪəm/ === Noun === quadrennium (plural quadrenniums or quadrennia) A period of 4 years, particularly (historical) the sets of four years in the ancient Egyptian and Greek calendars. Coordinate terms: annum, biennium, triennium, quinquennium, sexennium, septennium, octennium, novennium, decennium, vicennium, tricennium, centennium, quincentennium, millennium, decamillennium, centimillennium, millionennium ==== Synonyms ==== tetraeteris, tetraeterid, olympiad ==== Hypernyms ==== See Thesaurus:quartet ==== Related terms ==== (adj.) quadrennial === References === “quadrennium, n.”, in OED Online ⁠, Oxford: Oxford University Press, 2022.