Meaning of equivalence principle

equiv'alence prin"ciple

Pronunciation: [key]
— Physics. 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. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.