• (countable) A device that can transmit radio signals.
  • (countable) A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.
  • (uncountable) The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves.
  • (Internet, uncountable) The continuous broadcasting of sound recordings via the Internet in the style of traditional radio.


  • (transitive) To order or assist (to a location), using telecommunications.
  • (intransitive, transitive, transitive, intransitive) To use two-way radio to transmit (a message) (to another radio or other radio operator).

    "I think the boat is sinking; we'd better radio for help. / I radioed him already. / Radio the coordinates this time. / OK. I radioed them the coordinates."

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