Meaning of “activity” - Learner’s Dictionary

activity

noun us uk /ækˈtɪvəti/
Extra Examples
leisure activitiesThe aim of this activity is firstly to have fun, and secondly to keep fit.Try to spend your leisure time doing activities you really enjoy.She doesn't usually take part in any of the class activities.The charity supports activities that directly benefit children.
EVENT [ C ]

A2 something that you do for enjoyment, especially an organized event:

The centre offers a range of activities, such as cycling, swimming, and tennis.
WORK [ C, U ]

B2 the work of a group or organization to achieve an aim:

criminal/terrorist activities
MOVEMENT [ U ]

B2 a situation in which a lot of things are happening or people are moving around:

There was a sudden flurry of activity (= short period of activity) at the back of the hall.
→ Opposite inactivity (inactive)

(Definition of “activity” from the Cambridge Learner’s Dictionary © Cambridge University Press)