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  1  definition  found 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
  Any  computer  processor  which  assists  the  main  processor  (the 
  "{CPU}")  by  performing  certain  special  functions,  usually  much 
  faster  than  the  main  processor  could  perform  them  in  software. 
  The  coprocessor  often  decodes  instructions  in  parallel  with 
  the  main  processor  and  executes  only  those  instructions 
  intended  for  it 
  The  most  common  example  is  a  {floating  point}  coprocessor  (or 
  "{FPU}"),  others  are  graphics  and  networking.