Definition of jiffy noun from the Oxford Advanced Learner's Dictionary

 

jiffy

 noun
noun
BrE BrE//ˈdʒɪfi//
 
; NAmE NAmE//ˈdʒɪfi//
 
[usually singular](informal)(pl. jiffies)
 
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a moment I'll be with you in a jiffy (= very soon). Word Origin late 18th cent.: of unknown origin.
See the Oxford Advanced American Dictionary entry: jiffy

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