Special relativity and Theory of relativity

Special relativity noun - A physical theory of relativity based on the assumption that the speed of light in a vacuum is a constant and the assumption that the laws of physics are invariant in all inertial systems.

Theory of relativity and special relativity are semantically related. In some cases you can use "Theory of relativity" instead a noun phrase "Special relativity".

Theory of relativity noun - (physics) the theory that space and time are relative concepts rather than absolute concepts.

Special relativity and theory of relativity are semantically related. Sometimes you can replace phrase "Special relativity" with "Theory of relativity", this phrases are similar.