Definition of "activity" in English

noun

1. (uncountable) The state or quality of being active; activeness.

   • Pit row was abuzz with activity.

2. (countable) Something done as an action or a movement.

   • The activity for the morning was a walk to the store.

3. (countable) Something done for pleasure or entertainment, especially one involving movement or an excursion.

   • An increasing number of sports activities are on offer at the university.
   • Quilting can be an enjoyable activity.

4. (grammar, semantics) The lexical aspect (aktionsart) of verbs or predicates that change over time and have no natural end point.

5. (physics) The number of radioactive decays per unit time. Unit for it: becquerel or curie

6. The property of substances to react with other substances