attosecond

noun at·to·sec·ond \ ˈa-(ˌ)tō-ˌse-kənd , -kənt \

Definition of attosecond

: one quintillionth (10−18) of a second
  • An attosecond is to a second what a second is to the age of the universe.
  • IEEE Spectrum

Origin and Etymology of attosecond


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