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2 definitions found
 for POSIX
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

         Portable Operating System for unIX (OS, IEEE 1003, ISO 9945,
  PASC, Unix)

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

  Portable Operating System Interface
      (POSIX) A set of IEEE standards
     designed to provide application portability between Unix
     variants.  IEEE 1003.1 defines a Unix-like operating system
     interface, IEEE 1003.2 defines the shell and utilities and
     IEEE 1003.4 defines real-time extensions.
     ["More UNIX For Dummies", ISBN: 1-56884-361-5] says it stands
     for "Portable Operating System Interface with an X thrown in
     to make it sound cooler."

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