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Abstract class

<programming> In object-oriented programming, a class designed only as a parent from which sub-classes may be derived, but which is not itself suitable for instantiation. Often used to "abstract out" incomplete sets of features which may then be shared by a group of sibling sub-classes which add different variations of the missing pieces.

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ABR abscissa ABSET absolute path absolute pathname	C++ class concrete class Eiffel	abstract data type abstract interpretation abstraction abstract machine Abstract Machine Notation