Polymorphism means that an expression can produce values of more than one type.

Related concepts:  TypeSubtyping

Closest Wikipedia entry:  Polymorphism (computer science) — In programming languages and type theory, polymorphism is the provision of a single interface to entities of different types or the use of a single symbol to represent multiple different types.The most commonly recognized major classes of polymorphism are: Ad hoc polymorphism: defines a common interface for an arbitrary set of individually specified types. Parametric polymorphism: when one or more types are not specified by name but by abstract symbols that can represent any type. Subtyping (also called subtype polymorphism or inclusion polymorphism): when a name denotes instances of many different classes related by some common superclass.

Misconceptions about Polymorphism
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