follow Dictionary.com

Write a Super Short Story to win an iPod!

time reversal

noun, Physics.
1.
the mathematical operation of reversing the direction of time. Symbol: T.
Origin
1920-1925
1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
time re versal 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.
Cite This Source
Encyclopedia Article for time re versal

time reversal

in physics, mathematical operation of replacing the expression for time with its negative in formulas or equations so that they describe an event in which time runs backward or all the motions are reversed. A resultant formula or equation that remains unchanged by this operation is said to be time-reversal invariant, which implies that the same laws of physics apply equally well in both situations, that the second event is indistinguishable from the original, and that the flow of time does not have any naturally preferred direction in the case of fundamental interactions. A motion picture of two billiard balls colliding, for example, can be run forward or backward with no clue to the proper time direction of the event

Learn more about time reversal with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Difficulty index for time reversal

Few English speakers likely know this word

Word Value for time

6
7
Scrabble Words With Friends