"A named set of security accounts. A SQL Server role can contain Windows NT users, Windows NT groups, SQL Server users, or other SQL Server roles from the same database." (Microsoft Corporation, "SQL Server 7.0 System Administration Training Kit", 1999)
"A predefined role defined at the server level and existing outside individual databases." (Microsoft Corporation, "SQL Server 7.0 System Administration Training Kit", 1999)
"A predefined role that exists at the server level. The scope of the role is limited to the SQL Server instance in which it is defined. Fixed server roles allow you to quickly assign permissions on the server to specific individuals. Roles can be compared to groups in the Window NT/2000 operating systems." (Anthony Sequeira & Brian Alderman, "The SQL Server 2000 Book", 2003)
"A predefined role at the server level that is used to control administrative access to the SQL Server instance." (Marilyn Miller-White et al, "MCITP Administrator: Microsoft® SQL Server™ 2005 Optimization and Maintenance 70-444", 2007)
"A predefined role that exists at the server level. The scope of the role is limited to the SQL Server instance in which it is defined." (Microsoft, "SQL Server 2012 Glossary", 2012)
"These are special groups in SQL Server that are used to limit the amount of administrative access that a user has once logged on to SQL Server." (Joseph L Jorden & Dandy Weyn, "MCTS Microsoft SQL Server 2005: Implementation and Maintenance Study Guide - Exam 70-431", 2006)
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