Computing
- Polymorphism (computer science), allowing program code to work with various types
- Polymorphism in object-oriented programming, the ability of an interface to be realized in multiple ways
- Dialog polymorphism, changing the form of a computer dialog every time it is presented to a user, in order to prevent habituation
- Polymorphic code, self-modifying program code designed to defeat anti-virus programs or to defeat reverse engineers
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