1. • noun - medium for communication
   • noun - an electronic receiver that detects and demodulates and amplifies transmitted signals
   • noun - a communication system based on broadcasting electromagnetic waves
   • verb - transmit messages via radio waves
   • adj - indicating radiation or radioactivity
2. • The wireless transmission through space of electromagnetic waves in the approximate frequency range from 10 kilohertz to 300,000 megahertz.
   • Communication of audible signals encoded in electromagnetic waves.
   • Transmission of programs for the public by radio broadcast.
   • An apparatus used to transmit radio signals; a transmitter.
   • An apparatus used to receive radio signals; a receiver.
   • A complex of equipment capable of transmitting and receiving radio signals.
   • A station for radio transmitting.
   • A radio broadcasting organization or network of affiliated organizations.
   • The radio broadcasting industry.
   • Often used to modify another noun: radio stations; radio programs.
   • To transmit by radio: radio a message to headquarters.
   • To transmit messages or a message by radio: a ship radioing for help.
3. • v - to transmit by radio (an apparatus for wireless communication)

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