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time reversal

noun, Physics.
the mathematical operation of reversing the direction of time. Symbol: T.
Origin of time reversal
1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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time-reversal in Science
time reversal  
A mathematical operation on the description of a physical system in which the signs of variables representing time are reversed. Also called time conjugation. See more at invariance.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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