| einstein | physicist born in Germany who formulated the special theory of relativity and the general theory of relativity |
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| einstein | a generalization of special relativity to include gravity (based on the principle of equivalence) |
| einstein | 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 |
| einstein | (physics) the theory that space and time are relative concepts rather than absolute concepts |
| einstein | of or relating to Albert Einstein or his theories |
| einstein | a radioactive transuranic element produced by bombarding plutonium with neutrons |