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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   inout
      <programming> A type or "mode" of function parameter that
      passes information in both directions - from the caller to the
      function and back to the caller, combining the in and out
      modes.  An "inout" parameter might be used where the function
      needs to read and update some data belonging to the caller as
      a side effect of its main purpose.
      (2010-01-19)