2.NounClipping of gymnasium; especially, a school gymnasium.
"It was pouring rain, so the kids played kickball in the gym instead of on the field.; Gym is my favourite period in this school.; I'm off to the gym for my pilates class."
3.NounClipping of gymnastics, often as sense 4.
4.NounA sports facility specialized for lifting weights, cardio machines, and other exercise (culturally differentiated from sense 1).
"hit the gym; He's been hitting the gym a lot. He has a membership at a commercial gym and also a bit of a home gym."
5.NounPhysical education class (PE class).
"gym teacher; gym class; She has gym on Tuesday and Thursday afternoons.; They played basketball in gym last week.; The gym teacher at our school makes us stretch before and after each class."