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    In papermaking, abbreviation for cross-machine direction. See Cross-Machine Direction.

    CD is also an abbreviation for compact disc, used to refer to both compact disc digital audio (or audio CD) or compact disc-read only memory. See Compact Disc.

    In networking, CD is also an abbreviation for collision detection. See Carrier Sense Multiple Access/Collision Detection.

    In telecommunications, CD is also an abbreviation for carrier detect. See Carrier Detect.

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