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WordReference Random House Unabridged Dictionary of American English © 2024com′pact disk′, - Computing, Sound Reproductionan optical disk approximately 43⁄4 in. (12 cm) in diameter, on which a program, data, music, etc., is digitally encoded for a laser beam to scan, decode, and transmit to a playback system, computer monitor, or television set. Abbr.: CD Cf. optical disk (def. 1).
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