c. 1400, "active or secular life," from Old French activité, from Medieval Latin activitatem (nominative activitas), a word in Scholastic philosophy, from Latin activus (see active). Meaning "state of being active, briskness, liveliness" recorded from 1520s; that of "capacity for acting on matter" is from 1540s.
1. The military on both sides are involved in intense activity.
2. There are signs of paramilitary activity supported from abroad.
3. Mr Dobson promised to widen the organisation's scope of activity.
4. We believe that this is a general model of managerial activity.
5. He had been engaging in some kind of kinky sexual activity.