Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One sextillionth (10-21) of a second.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A unit of time equal to 0.000 000 000 000 000 000 001 seconds and with symbol zs.

Etymologies

zepto- +‎ second (Wiktionary)

Examples

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Comments

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  • My guess is you won't get much done if that's all the time you have to do it.

    May 23, 2008

  • 0,000 000 000 000 000 000 001 of a second ("zs")

    May 17, 2008

  • one sextillionth of a second

    January 31, 2008

  • one trillionth of one billionth of one second

    February 2, 2007