S: (n) television, television system (a telecommunication system that transmits images of objects (stationary or moving) between distant points)
S: (n) monitor (a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble)
S: (n) monitor, monitor lizard, varan (any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles)
Verb
S: (v) monitor, supervise (keep tabs on; keep an eye on; keep under surveillance) "we are monitoring the air quality"; "the police monitor the suspect's moves"