activity
ac·tiv·i·ty / akˈtivitē/ • n. (pl. -ties) 1. the condition in which things are happening or being done: a sustained level of activity in the economy ∎ busy or vigorous action or movement: the room was a hive of activity.2. (usu. activities) a thing that a person or group does or has done. ∎ a recreational pursuit or pastime: a range of sports activities. ∎ (activities) actions taken by a group in order to achieve their aims: investigating anarchist activities.3. the degree to which something displays its characteristic property or behavior: abnormal liver enzyme activities. ∎ Chem. a thermodynamic quantity representing the effective concentration of a particular component in a solution or other system, equal to its concentration multiplied by an activity coefficient.
