The Free On-line Dictionary of Computing (19 January 2023):

SAML

    An XML framework for communicating user
   authentication, entitlement, and attribute information,
   developed by the Security Services Technical Committee of
   OASIS.

   SAML supports federation, allowing business entities to make
   assertions regarding the identity, attributes and entitlements
   of a subject (an entity that is often a human user) to other
   entities, such as a partner company or another enterprise
   application.

   (2011-05-12)