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

SSO
       Single Sign On


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

single sign-on
SSO

    (SSO) Any user authentication system permiting
   users to access multiple data sources through a single point
   of entry.  Part of an integrated access management framework.

   (2003-12-31)