from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A principle central to the theory of general relativity stating that a gravitational field is locally indistinguishable from the effects of an inertial force, such as the acceleration provided by a rocket engine.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics any of several principles, in
relativity, concerned with the uniformityof physical measurementsin different frames of reference
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