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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Remote Job Entry
   RJE
      <operating system> (RJE) A system, widely used in the mid/late
      1960s, for submitting jobs to mainframes like the IBM
    360 under OS/MFT.  Communication with the computer
    operator was via the keyboard and later via CRTs.
      (1999-03-26)