attosecond

Noun
  1. One quintillionth (10^-18) of a second;
    One thousandth of a femtosecond (synset 115260337)
    is a type of: time unit, unit of time - a unit for measuring time periods
    is a part of: femtosecond - one quadrillionth (10^-15) of a second; one thousandth of a picosecond

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