monitor

A display screen used to present visual output from a computer or other electronic device.

• He bought a wide curved monitor to make editing video files easier.

• Are two monitors really necessary for everyday office work?

A device used for observing, measuring, or recording a continuous physical process or condition.

• The nurse checked the heart monitor when the alarm sounded.

• Have you replaced the batteries in the baby monitor yet?

A person appointed to observe an activity and ensure it is conducted fairly and according to rules.

• International monitors were dispatched across the country during the general election.

• Who served as the hall monitor during morning recess?