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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.

Subjects: Regional and National History.

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