The condition in which things are happening or being done
Busy or vigorous action or movement
A thing that a person or group does or has done
A recreational pursuit or pastime
ACTIVITY, the state of being active [n]
Actions taken by a group in order to achieve their aims
The degree to which something displays its characteristic property or behavior
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