from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun In special relativity and general relativity, the observed mass of an object moving with respect to the observer. The relativistic mass is a function of the rest mass and the velocity of the object.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The
increasedmass of an object movingat relativistic speed relativeto an observer.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun (physics) the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases
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