activity · noun /ækˈtɪv.ə.ti/
Nouns: activity, inactivity
Adjectives: active, inactive, interactive, proactive
A2 C usually plural something that is done for enjoyment, especially an organized event
The centre offers a range of activities, such as cycling, swimming and tennis.
We did many activities: playing games, singing and [watching a] magic show. (Key English Test; A2; Thai)
B2 C or U the work of a group or organization to achieve an aim
He was found guilty of terrorist activity.
But Rollo was also a good man, so when a policeman, called Calloway, informed him about [Harry's] illegal activity, he turned against him. (First Certificate in English; B2; Italian)
B2 U when a lot of things are happening or people are moving around
Ministers are concerned by the low level of economic activity.
There was a lot of activity the other side of the room.
Technical progress and industrial activity are causing a lot of problems. (First Certificate in English; B2; Russian)