the condition of occurring in several different forms:the complexity and polymorphism of human cognition
Biology the occurrence of different forms among the members of a population or colony, or in the life cycle of an individual organism:the workers of this species exhibit polymorphism, specialized physical castes
Genetics the presence of genetic variation within a population, upon which natural selection can operate.
Computing a feature of a programming language that allows routines to use variables of different types at different times:object oriented programming introduces novel features like polymorphism
polymorphism in other Oxford dictionaries
Definition of polymorphism in the US English dictionary