noun

1. the practice or science of communicating over a distance by converting sounds or signals into electromagnetic waves and transmitting these directly through space, without connecting wires, to a receiving set, which changes them back into sounds, signals, etc.
2. pl. radios -·os′ such a receiving set, esp. one adapted for receiving the waves of the assigned frequencies of certain transmitters or broadcasting stations
3. 1. broadcasting by radio as an industry, entertainment, art, etc.
   2. all the facilities and related activities of such broadcasting

Etymology: contr. < radiotelegraphy

adjective

1. of, using, used in, sent by, or operated by radio
2. having to do with electromagnetic wave frequencies between c. 10 kilohertz and c. 300,000 megahertz

transitive verb, intransitive verb radioed -·oed′, radioing -·o′·ing