Etymology
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polymorphism (n.)

"capability of existing in different forms;" in zoology, "difference of form, structure, or type," 1839, from polymorph + -ism.

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Definitions of polymorphism

polymorphism (n.)
(genetics) the genetic variation within a population that natural selection can operate on;
polymorphism (n.)
(chemistry) the existence of different kinds of crystal of the same chemical compound;
Synonyms: pleomorphism
polymorphism (n.)
(biology) the existence of two or more forms of individuals within the same animal species (independent of sex differences);
From wordnet.princeton.edu