radio UK /ˈɹeɪ.diˌəʊ/US /ˈɹeɪ.diˌoʊ/noun 5verb 2forms 4phrases 1 noun5 •the technology that uses waves in the air to send sound and other signals over long distances •A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.(of a song, etc.) to play on/be played on/get played on/come on the radioWe heard a lovely song on the radio. •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. •(Internet) The continuous broadcasting of sound via the Internet in the style of traditional radio. •A device that can transmit radio signals. verb2 •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. •To order or assist (to a location), using telecommunications.“Could you call them here? I'd like to talk to them. Or if they're out in the field, radio them in.” — 2002 formsradioed · radioing · radioes · radios Phrases with radio radio aheadTo make make contact by radio at a destination before arriving there to let people there know one is coming and to make suitable arrangements.