Read the dictionary definition of monitor. All definitions for this word.
1. any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles
2. a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble
3. electronic equipment that is used to check the quality or content of electronic transmissions
4. display produced by a device that takes signals and displays them on a television screen or a computer monitor
5. an ironclad vessel built by Federal forces to do battle with the Merrimac
6. someone who gives a warning so that a mistake can be avoided
7. someone who supervises (an examination)
8. keep tabs on; keep an eye on; keep under surveillance
1. we are monitoring the air quality
2. the police monitor the suspect's moves
9. check, track, or observe by means of a receiver