quadrenniumEnglishOxford Dictionary of Englishquadrennium /kwɒˈdrɛniəm / ▸ noun (plural quadrennia /kwɒˈdrɛnɪə/)(plural or quadrenniums) a specified period of four years. – ORIGIN late 18th century: from Latin quadriennium, from quadri- ‘four’ + annus ‘year’.
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EnglishOxford Dictionary of English