monitor

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