Usually means: Very short, indeterminate unit of time.
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We found 35 dictionaries that define the word jiffy:

General (25 matching dictionaries)
  1. jiffy: Merriam-Webster
  2. jiffy: Oxford Learner's Dictionaries
  3. jiffy: American Heritage Dictionary of the English Language
  4. jiffy: Collins English Dictionary
  5. jiffy: Vocabulary.com
  6. Jiffy, jiffy: Wordnik
  7. jiffy: Cambridge Advanced Learner's Dictionary
  8. Jiffy, jiffy: Wiktionary
  9. jiffy: Webster's New World College Dictionary, 4th Ed.
  10. jiffy: The Wordsmyth English Dictionary-Thesaurus
  11. jiffy: Infoplease Dictionary
  12. Jiffy, jiffy: Dictionary.com
  13. jiffy: Online Etymology Dictionary
  14. jiffy: Cambridge Essential American English Dictionary
  15. Jiffy (convenience store), Jiffy (disambiguation), Jiffy (time), Jiffy: Wikipedia, the Free Encyclopedia
  16. Jiffy: Online Plain Text English Dictionary
  17. jiffy: Webster's Revised Unabridged, 1913 Edition
  18. jiffy: Rhymezone
  19. jiffy: AllWords.com Multi-Lingual Dictionary
  20. Jiffy: Dictionary of Phrase and Fable (1898)
  21. jiffy: FreeDictionary.org
  22. jiffy: The Phrontistery - A Dictionary of Obscure Words
  23. jiffy: Mnemonic Dictionary
  24. jiffy: TheFreeDictionary.com
  25. jiffy: Longman Dictionary of Contemporary English

Business (1 matching dictionary)
  1. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. jiffy: Free On-line Dictionary of Computing
  2. jiffy: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. jiffy: Idioms

Science (1 matching dictionary)
  1. How Many? A Dictionary of Units of Measurement (No longer online)

Slang (3 matching dictionaries)
  1. jiffy: Green’s Dictionary of Slang
  2. jiffy: English slang and colloquialisms used in the United Kingdom
  3. jiffy: Urban Dictionary

Tech (1 matching dictionary)
  1. Rane Professional Audio Reference (No longer online)

(Note: See jiffies as well.)

Definitions from Wiktionary (Jiffy)

noun:  (colloquial) A very short, unspecified length of time.
noun:  (computing) A unit of time defined by the frequency of its basic timer – historically, and by convention, 0.01 of a second, but some computer operating systems use other values.
noun:  (electronics) The length of an alternating current power cycle (1/60 or 1/50 of a second).
noun:  (physics) The time taken for light to travel a specified distance in a vacuum, usually one centimetre (approximately 33.3564 picoseconds), but sometimes one foot or the width of a nucleon.
noun:  (UK) Short for jiffy bag, a padded envelope.
noun:  Alternative form of Jiffy bag. [(UK) Synonym of padded envelope.]

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