Definitions for "Abstract superclass"
A superclass listed in the Apple Event Registry: Standard Suites, such as cObject or cOpenableObject, that is used only in definitions of object classes and not for real Apple event objects See also: object class
a class in which you define methods that aren't actually implemented by that class--they only provide place-holders such that subsequent subclasses must override those methods and supply their actual implementation
Same as abstract class.