# Category:Definitions/Relativity Theory

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This category contains definitions related to Relativity Theory.

Related results can be found in Category:Relativity Theory.

**Relativity Theory** is the branch of physics concerned with:

- the behaviour of matter travelling at speeds that are an appreciable fraction of the speed of light
- the structure of spacetime
- the theory of gravitation.

## Pages in category "Definitions/Relativity Theory"

This category contains only the following page.