Radio  —n. (pl. -s) 1 (often attrib.) A transmission and reception of sound messages etc. By electromagnetic waves of radio frequency. B apparatus for receiving, broadcasting, or transmitting radio signals. 2 a sound broadcasting (prefers the radio). B broadcasting station or channel (radio one). —v. (-es, -ed) 1 a send (a message) by radio. B send a message to (a person) by radio. 2 communicate or broadcast by radio. [short for radio-telegraphy etc.]