Usually means: One quadrillionth of a second.
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We found 14 dictionaries that define the word femtosecond:

General (12 matching dictionaries)
  1. femtosecond: Merriam-Webster
  2. femtosecond: Oxford Learner's Dictionaries
  3. femtosecond: Collins English Dictionary
  4. femtosecond: Vocabulary.com
  5. Femtosecond, femtosecond: Wordnik
  6. femtosecond: Wiktionary
  7. femtosecond: Dictionary.com
  8. Femtosecond: Wikipedia, the Free Encyclopedia
  9. femtosecond: Rhymezone
  10. femtosecond: FreeDictionary.org
  11. femtosecond: Mnemonic Dictionary
  12. femtosecond: TheFreeDictionary.com

Computing (2 matching dictionaries)
  1. femtosecond: CCI Computer
  2. femtosecond: Encyclopedia

(Note: See femtoseconds as well.)

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Definitions from Wiktionary (femtosecond)

▸ noun:  (metrology) An SI unit of time equal to 10⁻¹⁵ seconds. Symbol: fs

Similar:
fsec, femtofarad, femtogram, femtometer, femtocoulomb, femtogramme, femtometre, femtomole, fermi, nano-farad, more...

Opposite:
gigasecond, megasecond, kilosecond, microsecond, nanosecond

▸ Words similar to femtosecond

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▸ Popular adjectives describing femtosecond

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▸ Rhymes of femtosecond

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Similar:
fsec, femtofarad, femtogram, femtometer, femtocoulomb, femtogramme, femtometre, femtomole, fermi, nano-farad, more...

Opposite:
gigasecond, megasecond, kilosecond, microsecond, nanosecond



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