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yoctosecond

[yok-tuh-sek-uh nd] /ˈyɒk təˌsɛk ənd/
noun
1.
one septillionth (10 -24) of a second.
Abbreviation: ysec, ys.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for yoctosecond
noun

one septillionth (10-24) of a second; abbr. ys , yser

Word Origin

1996-2001

Dictionary.com's 21st Century Lexicon
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