attosecond

noun

Meaning

One quintillionth of a second, or 10^-18 seconds.

Examples

  • The development of attosecond laser pulses earned the 2023 Nobel Prize in Physics.
  • An attosecond is so brief that light can only travel the width of a few atoms during that time.

Synonyms: instant, moment, nanosecond, femtosecond