A class that contains one or more abstract methods, and therefore can never be instantiated. Abstract classes are defined so that other classes can extend them and make them concrete by implementing t [..]

A class that contains one or more abstract methods , and therefore can never be instantiated. Abstract classes are defined so that other classes can extend them and make them concrete by implementing [..]

A class that is missing definitions for one or more methods. You can’t thus create an object of that class. You must first create a subclass and provide definitions for the abstract methods. Unlike in [..]

In programming languages, an abstract class is a generic class (or type of object) used as a basis for creating specific objects that conform to its protocol, or the set of operations it supports. Abs [..]

An abstract class, in the context of Java, is a superclass that cannot be instantiated and is used to state or define general characteristics. An object cannot be formed from a Java abstract class; tr [..]

A class that cannot have direct instances. To define an abstract class, you provide the abstract class adjective in the define class form. All superclasses of an abstract class must also be abstract.

  In object-oriented programming, a class that is meant to be used only as a basis for subclasses. Objects can be created from the subclasses, but not from the abstract class itself. The purpose of an [..]

a class defining an interface only; used as a base class. Declaring a member function pure virtual makes its class abstract and prevents creation of objects of the abstract class. Use of abstract c [..]

<computer 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 [..]