gymPronunciation: /dʒɪm/Translate gym | into French | into German | into Italian | into Spanish Definition of gym noun 1a gymnasium. a place, typically a private club, providing a range of facilities designed to improve and maintain physical fitness and health. 2 [mass noun] gymnastics:I can’t do gym todayOrigin: late 19th century: abbreviationgym in other Oxford dictionaries Definition of gym in the US English dictionary