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time dilatation

American  
Or time dilation

noun

  1. Physics. (in relativity) the apparent loss of time of a moving clock as observed by a stationary observer.

Etymology

Origin of time dilatation

First recorded in 1955–60

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.