groupfunction

2. In math, a groupfunction is a rule that combines two things in a set to make another thing in the same set.

Addition is a groupfunction because adding two whole numbers always gives another whole number.

3. In computing, a groupfunction is a command that works on many rows of data at once and gives one result.

The database used a groupfunction to count all the orders from each customer.

4. A groupfunction can mean the special purpose that a group of people serves.

The safety team's groupfunction is to check the building every morning.