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Related to Lorentz factor: length contraction
Lorentz factor[′lȯr‚ens ‚fak·tər]
An important parameter in special relativity, equal to 1/√(1-(v / c)2), where c is the speed of light and v is the constant relative velocity of two frames of reference.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.