What is television? Historically, its definition was more or less set in stone. A television set was a very particular type of device, which served as the hub of audio-visual entertainment in a given household. To take Wikipedia’s description, it’s “a telecommunication medium for transmitting and receiving moving images that can be monochrome (black-and-white) or colored, with or without accompanying sound.”
Over time, the models, sizes and features evolved, but the basic meaning of the word “television” remained unchanged. That is, until recently.