• (RP) IPA: /ˈɹeɪdiˌəʊ/
  • (America) IPA: /ˈɹeɪdiˌoʊ/, [ˈɹeɪɾiˌoʊ]


  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) On-board entertainment system in a car, usually including a radio receiver as well as the capability to play audio from recorded media.
  4. (countable) A device that can transmit radio signals.
  5. (Internet, uncountable) The continuous broadcasting of sound via the Internet in the style of traditional radio.
Synonyms Translations Translations Translations Verb

radio (radios, present participle radioing; past and past participle radioed)

  1. (ambitransitive) 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.
  2. (transitive) To order or assist (to a location), using telecommunications.
    • 2002, Jack Dave, Death Bridge, iUniverse, ISBN 978-0-595-21407-5, page 40 ↗:
      “Could you call them here? I'd like to talk to them. Or if they're out in the field, radio them in.”
  • Russian: ради́ровать

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