Television
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Television (also, informally, "TV" and "telly") is the electronic transmission of moving pictures. Most television signals also include synchronized sound, an exception being surveillance cameras, which usually have no audio.
"Television" literally means "far sight". The word was formed by combining the Greek word τῆλε ("tele", or "far") with the Latin word visio-n ("sight", from video, vis- to see) — this coinage follows the pattern of telegraph ("far writer") and telephone ("far talker"). In general usage, the meaning of "television" has been expanded to also refer to receivers, and to both the video broadcasting industry and its programming.