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

SVID
       System V Interface Definition (Unix, AT&T, SCD)


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

System V Interface Definition
SVID

   (SVID) A standard allowing source code portability between
   different platforms running Unix System V.

   (1995-03-28)