noun, plural jiffies. Informal.
a very short time; moment: to get dressed in a jiffy.
Also, jiff [jif] .

1770–80; origin uncertain

instant, flash, second, trice.
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World English Dictionary
jiffy or jiff (ˈdʒɪfɪ, dʒɪf)
n , pl jiffies, jiffs
informal a very short time: wait a jiffy
[C18: of unknown origin]
jiff or jiff
[C18: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1785, "a moment, an instant," colloquial, origin unknown; said to be originally thieves' slang for "lightning."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
jiffy (that is, a very brief period of time)
The American Heritage® Abbreviations Dictionary, Third Edition
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Published by Houghton Mifflin Company. All rights reserved.
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