/ ækˈtɪvəti; NAmE / noun ( pl. -ies )
1.
[ U ] a situation in which sth is happening or a lot of things are being done :
economic activity
The streets were noisy and full of activity.
Muscles contract and relax during physical activity.
—compare inactivity
2.
[ 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
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WORD ORIGIN
late Middle English : from French activité or late Latin activitas , from Latin act- done, from the verb agere .