(1) A security function of the operating system used to authorize users to any part of the system that is required by a job or task.
(2) In CICS/VSE, the facility provided by CICS for the control of access to resources protected by RSL security. The resources that can be protected include transactions, data sets, and transient data destinations. In CICS Transaction Server, the facility provided by CICS and RACF for the control of access to resources protected by RACF security classes. The resources that can be protected include transactions, data sets, and transient data destinations.