"To remove partially completed transactions after a database or other system failure." (Microsoft Corporation, "SQL Server 7.0 System Administration Training Kit", 1999)
"To reverse changes made by transactions that were uncommitted at the point in time to which a database is being recovered." (Thomas Moore, "MCTS 70-431: Implementing and Maintaining Microsoft SQL Server 2005", 2006)
"To reverse or undo changes made so far." (Marilyn Miller-White et al, "MCITP Administrator: Microsoft® SQL Server™ 2005 Optimization and Maintenance 70-444", 2007)
"The process of undoing uncommitted transactions. As a part of the recovery process, uncommitted transactions are rolled back to ensure the database is recovered in a consistent state." (Darril Gibson, "MCITP SQL Server 2005 Database Developer All-in-One Exam Guide", 2008)
"Undo the changes made by a transaction, restoring the database to the state it was in before the transaction began." (Jan L Harrington, "Relational Database Design and Implementation" 3rd Ed., 2009)
"End a transaction, undoing any changes made by the transaction and restoring the database to the state it was in before the transaction began." (Jan L Harrington, "SQL Clearly Explained" 3rd Ed., 2010)
"To reverse changes." (Microsoft, "SQL Server 2012 Glossary", 2012)
"To undo the database statements performed prior to a commit of the transaction." (Craig S Mullins, "Database Administration", 2012)
"To restore data that is changed by an SQL statement to the state at its last commit point." (IBM, "Informix Servers 12.1", 2014)
"To return to a previous version, as in rolling back a device driver." (Faithe Wempen, "Computing Fundamentals: Introduction to Computers", 2015)
"To restore data that is changed by an SQL statement to the state at its last commit point." (Sybase, "Open Server Server-Library/C Reference Manual", 2019)
"To return the values changed by a transaction to their original state." (Microsoft, "ODBC Glossary")
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