Definitions of monitor:
- noun: any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles
- noun: a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble
- noun: electronic equipment that is used to check the quality or content of electronic transmissions
- noun: display consisting of a device that takes signals from a computer and displays them on a CRT screen
- noun: an iron-clad vessel built by Federal forces to do battle with the Merrimac
- noun: someone who gives a warning so that a mistake can be avoided
- noun: someone who supervises (an examination)
- verb: keep tabs on; keep an eye on; keep under surveillance