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2 definitions found
 for EXCH
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  EXCH
   /eks'ch@/, /eksch/, vt.
  
      To exchange two things, each for the other; to swap places. If you point to
      two people sitting down and say ?Exch!?, you are asking them to trade
      places. EXCH, meaning EXCHange, was originally the name of a PDP-10
      instruction that exchanged the contents of a register and a memory
      location. Many newer hackers are probably thinking instead of the {
      PostScript exchange operator (which is usually written in lowercase).
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  EXCH
  
      /eks'ch*/ or /eksch/ To exchange two things, each for
     the other; to swap places.  If you point to two people sitting
     down and say "Exch!", you are asking them to trade places.
     EXCH, meaning EXCHange, was originally the name of a PDP-10
     instruction that exchanged the contents of a register and a
     memory location.
  
     Many newer hackers are probably thinking instead of the
     PostScript exchange operator (which is usually written in
     lowercase).
  
     [{Jargon File]
  
     (1999-09-17)
  

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