MICHAELMAS Meaning of MICHAELMAS in English [ 'mɪk(ə)lməs ]■ noun the feast of St Michael, 29 September.OriginOE Sanct Michaeles mæsse 'Saint Michael's Mass', referring to the Archangel. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004