the mathematical operation of reversing the direction of time. Symbol: T
Super Spooky Night Time WordsRead more in this article about some frequently asked questions and fun facts related to our definitions.
Is It “Sometime,” “Sometimes,” Or “Some Time”?While they appear very similar, sometime, sometimes, and some time have slightly different meanings. Sometime means a vague point in time, and usually refers to a long amount of time. Sometimes means occasionally. Some time refers to a period of time. Sometime Sometime refers to an unspecified point in time. It functions as an adverb, and is also synonymous with someday, one day, or sooner …
- time of one's life,
- time off,
- time on one's hands,
- time out,
- time out of mind,
- time series,
- time sharing,
- time sheet,
- time signal,
- time signature
Origin of time reversal
First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.