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

CMC
       Common Messaging Calls [interface] (XAPIA)


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

CMC
       Complement Carry Flag (assembler)


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

CMC
       Computer Mediated Communications [studies centre] (org., USA)


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

CMC

   1.  Computer Mediated Communication.

   2.  Common Mezzanine Card.