#cycle.periodic_event  a single complete execution of a periodically repeated phenomenon: "a year constitutes a cycle of the seasons"
  supertype:  periodic_event__recurrent_event__recurrentevent  an event that recurs at intervals
  subtype:  cardiac_cycle__cardiaccycle  the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse in conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles; "the cardiac cycle can be shown on an electrocardiogram"
  subtype:  Carnot_cycle__Carnot's_ideal_cycle  a cycle (of expansion and compression) of an idealized reversible heat engine that does work without loss of heat
  subtype:  pass.cycle  one complete cycle of operations (as by a computer); "it was not possible to complete the computation in a single pass"
  subtype:  menstrual_cycle__menstrualcycle  a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation; "the average menstrual cycle is 28 days"

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