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jiffy: n. 1. The duration of one tick of the system clock on the
   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.  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*.  3. 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.