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Einstein's equivalency principle

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noun Physics.
  1. equivalence principle.
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equivalence principle

noun Physics.
  1. (in relativity) the principle that, in any small region of space-time, the effects of a gravitational field are indistinguishable from those of an appropriate acceleration of the frame of reference.
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Origin of equivalence principle

First recorded in 1915–20
Also called Einstein's equivalency principle, principle of equivalence.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

einstein's equivalency principle in Science

equivalence principle

[ĭ-kwĭvə-ləns]
  1. A principle central to General Relativity stating that a gravitational field is locally indistinguishable from the effects of inertial forces. For example, according to the equivalence principle, it is impossible for someone in a box who experiences a force pushing him to the bottom of the box to know, from the force alone, whether that force is the result of a gravitational field (the box is standing on the surface of a planet) or an acceleration (the box is being pushed by a rocket).
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