Source : WordNet®

rollback
     n 1: the act of forcing the enemy to withdraw [syn: {push back}]
     2: reducing prices back to some earlier level

Source : Free On-Line Dictionary of Computing

rollback
     
         Reverting data in a {database} to an earlier state,
        usually in response to an error or aborted operation.
     
        In a {transaction} based database system, transactions are
        considered {atomic}.  If an error occurs while performing a
        transaction, the database is automatically rolled back
        to the state at the previous {commit}.
     
        Rollback may also be performed by an explicit rollback
        transaction.
     
        (2000-01-15)