V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

MVSESA
       Multiple Virtual Storage/Extended System Architecture (IBM),
"MVS/ESA"


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

Multiple Virtual Storage
MVS
MVS/ESA
MVS/OE
MVS/Open Edition
MVS/SP
MVS/XA

    (MVS) Release 2 of OS/VS2, called MVS
   because it had multiple 16 MB virtual address spaces, in
   contrast to SVS.  MVS ran on the IBM 390 series
   mainframes.  It became MVS/SP, then MVS/XA (with 31-bit
   addressing) and then MVS/ESA.

   MVS/Open Edition (MVS/OE), aimed at the growing open systems
   market, added TCP/IP and Unix support in an MVS address
   space, allowing users to run IBM, CICS-type applications,
   batch applications and Unix.

   MVS/ESA was repackaged as OS/390 as a marketing exercise but
   it's basically the same thing.

   Version: 5.1.

   [Features?  Dates?]

   (1999-01-20)