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time dilatation

or time dilation

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noun
Physics. (in relativity) the apparent loss of time of a moving clock as observed by a stationary observer.
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QUIZ YOURSELF ON "WAS" VS. "WERE"!
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Origin of time dilatation

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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