/ dʒɪm; NAmE / noun ( informal )
1.
(also formal gym·na·sium ) [ C ] a room or hall with equipment for doing physical exercise, for example in a school :
to play basketball in the gym
The school has recently built a new gym.
2.
[ U ] physical exercises done in a gym, especially at school :
I don't enjoy gym.
gym shoes
3.
[ C ] = health club :
I just joined a gym.
I work out at the gym most days.
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WORD ORIGIN
late 19th cent.: abbreviation.