exercise
noun(ex-er-cise)
systematic training by multiple repetitions
exercise
verb(ex-er-cise)
learn by repetition
exercise
noun(ex-er-cise)
the act of using
exercise
noun(ex-er-cise)
the activity of exerting your muscles in various ways to keep fit
Examples:
The doctor recommended regular exercise. 
exercise
verb(ex-er-cise)
do physical exercise
Synonyms: work out, 
exercise
verb(ex-er-cise)
give a workout to
Synonyms: work, work out, 
 Examples:
Some parents exercise their infants. 
This puzzle will exercise your mind. 
exercise
noun(ex-er-cise)
a task performed or problem solved in order to develop skill or understanding
exercise
verb(ex-er-cise)
carry out or practice; as of jobs and professions
exercise
verb(ex-er-cise)
put to use
exercise
noun(ex-er-cise)
an action, often used negatively and without consequences
Examples:
An exercise in futility. 
An exercise in cheap talk. 
exercise
noun(ex-er-cise)
(usually plural) a ceremony that involves processions and speeches
Examples:
Academic exercises.