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decshort for declination.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
On drawings, abbr. for “decimal.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
/dek/ decrement, decrease by one. Especially used by assembly language programmers, as many assembly languages have a "dec" mnemonic.
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DECThe trade name for Digital Equipment Corporation's earlier products (DECmate, DECnet, etc.). Many people used to refer to the company as DEC. In 1998, Digital was acquired by Compaq. See Digital Equipment.
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