Source : WordNet®

DC
     n 1: the district occupied entirely by the city of Washington;
          chosen by George Washington as the site of the nation's
          capital and carve out of land ceded by Maryland and
          Virginia [syn: {District of Columbia}, {D.C.}]
     2: an electric current that flows in one direction steadily
        [syn: {direct current}] [ant: {alternating current}]

Source : Free On-Line Dictionary of Computing

DC
     
         The {Unix} {arbitrary precision} {postfix}
        calculator and its language.
     
        Here is an example program which prints out {factorial}s:
     
        	echo "[la1+dsa*pla2220>y]sy0sa1lyx" | dc
     
        {Unix manual page}: dc(1).
     
        {bc} provides a somewhat more readable syntax which is
        compiled into dc.  There is also a {GNU DC}.
     
        (1995-03-17)