/ ækˈtɪvəti; NAmE / noun ( pl. -ies )
[ U ] a situation in which sth is happening or a lot of things are being done :
The streets were noisy and full of activity.
Muscles contract and relax during physical activity.
[ C , usually pl. ] a thing that you do for interest or pleasure, or in order to achieve a particular aim :
leisure / outdoor / classroom activities
The club provides a wide variety of activities including tennis, swimming and squash.
illegal / criminal activities
late Middle English : from French activité or late Latin activitas , from Latin act- done, from the verb agere .