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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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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of time dilatation

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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