noun

1. A very short, unspecified length of time.

   “I’ll be back in a jiffy.”

2. A unit of time defined by the frequency of its basic timer – historically, and by convention, 0.01 of a second, but some computer operating systems use other values.

3. The length of an alternating current power cycle (1/60 or 1/50 of a second).

Synonyms: jif, jiff