Definitions

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

  • n. One septillionth (10-24) of a second.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An SI unit of time equal to 10−24 seconds.

Etymologies

yocto- +‎ second (Wiktionary)

Examples

  • Maybe the 'inflation' that physicists postulate as occupying some fraction of the first yoctosecond of the universe's existence will turn out, when it is better understood, to be a cosmological crane to stand alongside Darwin's biological one.

    The God Delusion

  • This is similar to the inability of the New York Times 'own search engine to unearth articles that appear this very day, while a simple Google search using the author and the name of someone in the article invariably brings up the desired story first among the results in a New York yoctosecond. bookofjoe Contest: Name something that vibrates that once didn't bookofjoe Contest: Name something that vibrates that once didn't bookofjoe Contest: Name something that vibrates that once didn't bookofjoe Contest: Name something that vibrates that once didn't bookofjoe Contest: Name something that vibrates that once didn't bookofjoe Contest: Name something that vibrates that once didn't

    Charlottesville Blogs

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  • ~ Abbr. ys or ysec
    ~ One septillionth (10-24) of a second

    January 18, 2009

  • Unit of time equal to 0.000000000000000000001 seconds. Symbol 'ys.'

    December 10, 2006