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

  process identifier
  process ID
      (PID) An integer used by the Unix
     kernel to uniquely identify a process.  PIDs are returned by
     the fork system call and can be passed to wait() or
     kill() to perform actions on the given process.

Contact=webmaster@dict.org Specification=RFC 2229