a thing that you do for interest or pleasure

a thing that somebody does in order to achieve a particular aim

criminal/terrorist/illegal activities

He has decided to focus his time and resources on his business activities.

We met to review progress and to coordinate our activities.

a situation in which something is happening or a lot of things are being done

Economic activity has taken a downturn this year.

The streets were noisy and full of activity.

Muscles contract and relax during physical activity.

There was no criminal activity involved.

The machines can monitor brain activity.

LEARNit Dictionary