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black magic

magic used for evil purposes; witchcraft; sorcery (contrasted with white magic). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for black magic

black magic

magic used for evil purposes by invoking the power of the devil
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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black magic in Technology

(Or "FM") A technique that works, though nobody really understands why. More obscure than voodoo programming, which may be done by cookbook.
Compare black art, deep magic, and magic number.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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