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zeptosecond

American  
[zep-tuh-sek-uhnd] / ˈzɛp təˌsɛk ənd /

noun

  1. one sextillionth (10-21 ) of a second. zsec, zs


Example Sentences

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They have been measured to the millimeter, timed to the zeptosecond and asked what kind of forest animal they would be.

From Washington Post ● Apr. 28, 2021

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