WordNet sense 1 (broadcasting visual images of stationary or moving objects):

video, telecasting, TV

WordNet sense 2 (an electronic device that receives television signals and displays them on a screen):

telly, television receiver, boob tube, goggle box, idiot box, television set, tv set

WordNet sense 3 (a telecommunication system that transmits images of objects (stationary or moving) between distant points):

television system