atto- + second
"attosecond." YourDictionary, n.d. Web. 17 October 2018. <http://www.yourdictionary.com/attosecond>.
attosecond. (n.d.). Retrieved October 17th, 2018, from http://www.yourdictionary.com/attosecond
One quintillionth of a second. See space/time and ohnosecond.
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