1. The first electronic mass medium of communication, involving an audio signal broadcast wirelessly in the form of radio waves from a high-power transmitter to a low-power receiver (radio set). Radio shares many of its representational and institutional characteristics with television. See also live; radio genres.
2. A means of interpersonal communication over short distances which uses transmitter/receiver devices that use a low-power half-duplex radio signal.
Chandler, D., & Munday, R. (2020). Radio. In A Dictionary of Media and Communication. Oxford University Press. Retrieved 22 Oct. 2020