From WordNet (r) 3.0 (2006):
monitor
n 1: someone who supervises (an examination) [syn: proctor,
monitor]
2: someone who gives a warning so that a mistake can be avoided
[syn: admonisher, monitor, reminder]
3: an ironclad vessel built by Federal forces to do battle with
the Merrimac
4: display produced by a device that takes signals and displays
them on a television screen or a computer monitor [syn:
monitor, monitoring device]
5: electronic equipment that is used to check the quality or
content of electronic transmissions
6: a piece of electronic equipment that keeps track of the
operation of a system continuously and warns of trouble
7: any of various large tropical carnivorous lizards of Africa
and Asia and Australia; fabled to warn of crocodiles [syn:
monitor, monitor lizard, varan]
v 1: keep tabs on; keep an eye on; keep under surveillance; "we
are monitoring the air quality"; "the police monitor the
suspect's moves" [syn: monitor, supervise]
2: check, track, or observe by means of a receiver