Definitions for "General Relativity"
A theory formulated by Albert Einstein. General Relativity expands the theory of Special Relativity to include acceleration and gravity, both of which are explained via the curvature of space-time.
Einstein generalized his theory of special relativity to include gravity, and called it a general theory of relativity. It showed that apples fall to the ground because the Earth's mass curves the adjacent space-time, forcing apples to move in a special way-towards the surface of the Earth. It has proved, however, extremely difficult to unify General Relativity with quantum mechanics. String theory is currently the best hope for a theory of quantum gravity.
Einstein's formulation of gravity, which shows that space and time communicate the gravitational force through their curvature.