Polymorphism

Webster's Dictionary of the English Language

·noun ·same·as Pleomorphism.

II. Polymorphism ·noun The capability of assuming different forms; the capability of widely varying in form.

III. Polymorphism ·noun Existence in many forms; the coexistence, in the same locality, of two or more distinct forms independent of sex, not connected by intermediate gradations, but produced from common parents.