Definition of monitor

In general:anything that keeps track of something else.
Computers:

1. program that supervises the activity of other programs.
2. device similar to a television set that accepts video signals from a computer and displays information on its screen.

1. a computer program that supervises the activity of other programs.
2. a device similar to a television set that accepts video signals from a computer and displays information on its screen. The monitor itself does no computing at all. See also dot pitch; eyeglasses, computer; super VGA; VGA.

1. instrument used to audit something, as a receiver used in a television studio to view the picture being picked up by the camera, or hardware that displays the operations of a computer system.
2. using a receiver to listen to or view a radio or television broadcast to check fidelity and quality, as well as content.
3. regulate or control, from a control booth, the production of a radio or television show or an audio recording session.