# Definition:Domain

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## Disambiguation

This page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

**Domain** may refer to:

- The concept of domain in set theory, in the contexts of mapping theory, relation theory and abstract algebra.

- The domain of a variable.

- The concept of domain in category theory.

- The concept of integral domain in ring theory.

- Another term for an open region.