QUADRENNIUM Meaning of QUADRENNIUM in English [ kwɒ'drɛnɪəm ]■ noun ( plural quadrennia -nɪə or ~s ) a period of four years.OriginC19: from L. quadriennium , from quadri- 'four' + annus 'year'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004