Definition from macmillandictionary.com
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These environmental changes are the result of human activity.
Economic activity was greater during the first part of the year.
Airline staff should always be on the watch for criminal activity.
Employees should not engage in political activities without a manager’s permission.
She coordinates the activities of all senior managers.
We plan to expand our business activities in East Africa.
Guests can enjoy plenty of activities, like swimming, surfing, and horse-riding.
On Saturdays, there’s always lots of activity in the streets.