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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. 2 : a television receiving set. -
Radio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another. ... When radio signals are sent out to many receivers at the same time, it is called a broadcast. Television also uses radio signals to send pictures and sound.
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