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- n. The generic term of the special relativity and the general relativity, two theories in physics developed mainly by Albert Einstein at the beginning of the 20th century from which several important results such as the equivalence of matter and energy and the Einstein field equations are derived.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (physics) the theory that space and time are relative concepts rather than absolute concepts
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