In general, polymorphism describes multiple possible states for a single property (it is said to be polymorphic, or polymorphous).
Polymorphism may specifically refer to:
- Polymorphism (biology), having multiple alleles of a gene within a population, usually expressing different phenotypes;
- Polymorphism (biophysics) also referred to as Lipid polymorphism, the property of amphiphiles that gives rise to various aggregations of lipids;
- Type polymorphism, allowing program code to work with various types
- Polymorphism in object-oriented programming;
- Polymorphic code, self-modifying program code designed to defeat anti-virus programs;
- Polymorphism (materials science), the ability of a solid material to exist in more than one form or crystal structure;
- Polymorphism (botany), the ability of a plant to produce both quiescent and dormant seeds.
- In sexology, polymorphous perversity