Definitions
1.NounA very short, unspecified length of time. .mw-parser-output .defdate{font-size:smaller}"I’ll be back in a jiffy."
2.NounA 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.NounThe length of an alternating current power cycle (1/60 or 1/50 of a second).
4.NounThe time taken for light to travel a specified distance in a vacuum, usually one centimetre (approximately 33.3564 picoseconds), but sometimes one foot or the width of a nucleon.
5.NounEllipsis of jiffy bag, a padded envelope.