Theory of relativity

method pertaining to science and specifically physics, Einstein's theory

The theory of relativity, or simply relativity, refers specifically to two theories: Albert Einstein's special relativity and general relativity.The term "relativity" was coined by Max Planck in 1908 to emphasize how special relativity (and later, general relativity) uses the principle of relativity.
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Noun
1. (physics) the theory that space and time are relative concepts rather than absolute concepts
(synonym) relativity, relativity theory, Einstein's theory of relativity
(hypernym) scientific theory
(hyponym) general relativity, general theory of relativity, general relativity theory, Einstein's general theory of relativity
(classification) physics, physical science, natural philosophy
(class) event