Meaning of ACTIVITY in English

■ noun ( plural activities )

1》 a condition in which things are happening or being done.

↘busy or vigorous action or movement.

2》 an action taken in pursuit of an objective.

↘a recreational pursuit.

3》 the degree to which something displays its characteristic property or behaviour.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.