LACTATION Meaning of LACTATION in English ■ noun1》 the secretion of milk by the mammary glands. 2》 the suckling of young.Derivatives~al adjective OriginC17: from L. lactatio(n-) , from lactare 'suckle'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004