General relativity , also known as the general theory of relativity

General relativity, also known as the general theory of relativity, is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics.

a geometric theory of gravitation put forward by Einstein in 1916

(The general theory of relativity is a geometric theory of gravitation put forward by Einstein in 1916.

an extension of special relativity

The General Theory of Relativity is an extension of special relativity, dealing with curved coordinate systems, accelerating frames of reference, curvilinear motion, and curvature of spacetime itself.

a theory of gravity

The general theory of relativity is at relativity's heart a theory of gravity.