Usually means: One quintillionth of a second.
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We found 12 dictionaries that define the word attosecond:

General (12 matching dictionaries)
  1. attosecond: Merriam-Webster
  2. attosecond: Vocabulary.com
  3. attosecond: Wordnik
  4. attosecond: Wiktionary
  5. attosecond: Dictionary.com
  6. Attosecond: Wikipedia, the Free Encyclopedia
  7. attosecond: Rhymezone
  8. attosecond: FreeDictionary.org
  9. attosecond: Mnemonic Dictionary
  10. attosecond: TheFreeDictionary.com
  11. attosecond: Longman Dictionary of Contemporary English
  12. attosecond: Merriam-Webster

(Note: See attoseconds as well.)

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Definitions from Wiktionary (attosecond)

▸ noun:  (metrology) An SI unit of time equal to 10⁻¹⁸ seconds. Symbol: as

Similar:
rontosecond, exasecond, megasecond, yoctosecond, nanosecond, zeptosecond, picosecond, attometre, zettasecond, microsecond, more...

Opposite:
gigasecond, megasecond, kilosecond

Types:
zeptosecond, yoctosecond, femtosecond, more...

Phrases:
Attosecond physics, more...

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Similar:
rontosecond, exasecond, megasecond, yoctosecond, nanosecond, zeptosecond, picosecond, attometre, zettasecond, microsecond, more...

Opposite:
gigasecond, megasecond, kilosecond

Types:
zeptosecond, yoctosecond, femtosecond, more...

Phrases:
Attosecond physics, more...



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