A jiffy is a brief amount of time — an instant, or a split second. When you're really tired at the end of a long day, you probably fall asleep in a jiffy after lying in bed.

Jiffy is an informal word that can substitute for "quickly" or "in the blink of an eye." A speeding taxi will get you to your destination in a jiffy, and a really well-trained dog will come in a jiffy when you call her name. Not much is known about the origin of jiffy, other than the fact that it was once "thieves' slang" for "lightning."

Definitions of jiffy
  1. noun
    a very short time (as the time it takes the eye to blink or the heart to beat)
Word Family

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