Source : WordNet®

Dec
     n 1: the last (12th) month of the year [syn: {December}]
     2: (astronomy) the angular distance to a point on a celestial
        object measured north or south from the celestial equator;
        expressed in degrees; used with right ascension to specify
        positions on the celestial sphere [syn: {declination}, {celestial
        latitude}]

Source : Free On-Line Dictionary of Computing

DEC
     
        {Digital Equipment Corporation}

dec
     
         /dek/ decrement, decrease by one.  Especially
        used by {assembly language} programmers, as many assembly
        languages have a "dec" {mnemonic}.
     
        Opposite: {inc}.
     
        [{Jargon File}]