Definition of radio noun from the Oxford Advanced American Dictionary

      

    radio

     noun
    noun
    NAmE//ˈreɪdiˌoʊ//
     
     
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  1. 1 the radio [uncountable, singular] the activity of broadcasting programs for people to listen to; the programs that are broadcast The interview was broadcast on radio and television. The play was written especially for radio. Ilisten to the radio on the way to work. Did you hear the interview with him on the radio? local/national radio a radio program/station satellite radio
  2. 2 [countable] a piece of equipment used for listening to programs that are broadcast to the public to turn the radio on/off a car radio see also clock radio
  3. 3[uncountable] the process of sending and receiving messages through the air using electromagnetic waves He was unable to contact Blake by radio. to keep in radio contact radio signals/waves
  4. 4[countable] a piece of equipment, for example on ships or planes, for sending and receiving radio signals to hear a gale warning on/over the ship's radio
See the Oxford Advanced Learner's Dictionary entry: radio