Definitions
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noun 
  1. (uncountable) The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves.
  2. (countable) A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.
  3. (countable) A device that can transmit radio signal.
verb 
  1. To send a message by radio
''I think the boat is sinking, we'd better radio for help.
Usage note: Used for small radio transmitters carried by people, ships, etc, not for regular radio broadcasting to large audiences.
Etymology: From Latin radius, "ray"


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