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jiffy (n.)

1785, "a moment, an instant, short space of time," colloquial, origin unknown; said to have been thieves' slang for "lightning."

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Definitions of jiffy from WordNet

jiffy (n.)
a very short time (as the time it takes the eye to blink or the heart to beat);
Synonyms: blink of an eye / flash / heartbeat / instant / split second / trice / twinkling / wink / New York minute
From wordnet.princeton.edu