noun:an electronic system of sending images and sounds by a wire or through space
noun:an electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound
synonyms: shit box, tube, plebvision
Examples
There's nothing 'on television' right now. [=there are no programs that I would like to watch now]
I recognize your face. Are you 'on television'? [=do you appear in a television program?]
What is 'on the television' [='on TV', ('chiefly Brit') 'on (the) telly'] tonight?