rollbackPronunciation: /ˈrəʊlbak/Definition of rollback noun 1chiefly North American a reduction or decrease:a 5 per cent rollback of personal income taxes 2 Computing the process of restoring a database or program to a previously defined state, typically to recover from an error. verb [with object] Computing restore (a database) to a previously defined state. rollback in other Oxford dictionaries Definition of rollback in the US English dictionary