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2 definitions found
 for system call
From WordNet (r) 3.0 (2006) :

  system call
      n 1: an instruction that interrupts the program being executed
           and passes control to the supervisor [syn: system call,
           supervisor call instruction]

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

  system call
      The mechanism used by an
     application program to request service from the operating
     system.  System calls often use a special machine code
     instruction which causes the processor to change mode (e.g. to
     "supervisor mode" or "{protected mode").  This allows the OS
     to perform restricted actions such as accessing hardware
     devices or the memory management unit.

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