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Definitions of role-based access control:

Role-based access control (RBAC) is an alternative to traditional access control models (eg, discretionary or non-discretionary access control policies) that permits the specification and enforcement of enterprise-specific security policies in a way that maps more naturally to an organization's structure and business activities. ...
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In computer systems security Role-Based Access Control is an approach to restricting system access to authorized users. It is a newer and alternative approach to discretionary access control and mandatory access control.
en.wikipedia.org/wiki/Role-Based_Access_Control