Princeton's WordNet

1. blink of an eye, flash, heartbeat, instant, jiffy, split second, trice, twinkling, wink, New York minute(noun)

   a very short time (as the time it takes the eye to blink or the heart to beat)

   "if I had the chance I'd do it in a flash"

Wiktionary

1. jiffy(Noun)

   A very short, unspecified length of time.

   I'll be back in a jiffy.

2. jiffy(Noun)

   A unit of time defined by the frequency of its basic timer; historically, and by convention, 0.01 seconds, but some operating systems use other values.

3. jiffy(Noun)

   The time taken for light to travel one centimetre in a vacuum (sometimes one foot, or sometimes the width of a nucleon)

4. jiffy(Noun)

   The time between alternating current power cycles (1/60 or 1/50 of a second)

Webster Dictionary

1. Jiffy(noun)

   a moment; an instant; as, I will be ready in a jiffy

The New Hacker's Dictionary

1. jiffy

   1. The duration of one tick of the system clock on your computer (see tick). Often one AC cycle time (1/60 second in the U.S. and Canada, 1/50 most other places), but more recently 1/100 sec has become common. “The swapper runs every 6 jiffies” means that the virtual memory management routine is executed once for every 6 ticks of the clock, or about ten times a second. 2. Confusingly, the term is sometimes also used for a 1-millisecond wall time interval. 3. Even more confusingly, physicists semi-jokingly use ‘jiffy’ to mean the time required for light to travel one foot in a vacuum, which turns out to be close to one nanosecond. Other physicists use the term for the quantum-nechanical lower bound on meaningful time lengths, 4. Indeterminate time from a few seconds to forever. “I'll do it in a jiffy” means certainly not now and possibly never. This is a bit contrary to the more widespread use of the word. Oppose nano. See also Real Soon Now.

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