noun, verb, -cised, -cis·ing.
1. bodily or mental exertion, especially for the sake of training or improvement of health:
Somebody told me that if I exercise I can lose weight, and then I ate another donut.
2. something done or performed as a means of practice or training:
exercises for the violin make my ears bleed.
3. a putting into action, use, operation, or effect:
I told my children to exercise caution while sharpening my knives.