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

MAS
       Multi Agent Systems (AI)


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

MAS

   Modula-2 Algebra System.  Runs on IBM PC, Atari, Amiga.

   (ftp://alice.fmi.uni-passau.de).

   ["Modula-2 Algebra System", H. Kredel, Proc DISCO 90 Capri,
   LNCS 429, Springer 1990, pp270-271].