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1 definition found
 for system unit
From The Free On-line Dictionary of Computing (18 March 2015) :

  system unit
      The main body of a computer, consisting of a
     plastic or metal enclosure, the motherboard, and (typically)
     internal disk drives, a power supply, cooling fans, and
     whatever circuit boards plugged into the mother board, such as
     a video card.
     The system unit is occasionally referred to as the CPU,
     though this really means central processing unit.

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