Definition of jiffies:
(n) :
(colloquial) A very short, unspecified length of time.
(n) :
(computing) 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.
(n) :
(electronics) The length of an alternating current power cycle (1/60 or 1/50 of a second).
(n) :
(physics) The 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.
(n) :
(UK) Ellipsis of jiffy bag, a padded envelope.
(n) :
Alternative form of Jiffy bag. [(UK) Synonym of padded envelope.]