equivalence principle(redirected from Universality of free fall)
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Related to Universality of free fall: Weak equivalence principle
equivalence principle(i-kwiv -ă-lĕns) The principle that, on a local scale, the physical effects of a uniform acceleration of some frame of reference imitates completely the behavior in a uniform gravitational field. This equivalence of the two frames of reference was introduced by Albert Einstein in his general theory of relativity. It is a generalization of the observed direct proportionality between gravitational and inertial mass.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
equivalence principle[i′kwiv·ə·ləns ‚prin·sə·pəl]
In general relativity, the principle that the observable local effects of a gravitational field are indistinguishable from those arising from acceleration of the frame of reference. Also known as Einstein's equivalency principle; principle of equivalence.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.