Definition of "radio" in English

noun

1. (uncountable) The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves.

   • send a message by radio

2. (countable) A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.

   • We heard a lovely song on the radio.
   • She was listening to the radio when he knocked on the door.

3. (countable) Any audio playing device, such as the on-board entertainment system in a car, usually including a radio receiver as well as the capability to play audio from recorded media; see also car radio.

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.

verb

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.