libration - (astronomy) a real or apparent slow oscillation of a moon or satellite; "the libration of the moon"

natural action, natural process, activity, action - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"

natural philosophy, physical science, physics - the science of matter and energy and their interactions

ripple - (electronics) an oscillation of small amplitude imposed on top of a steady value

undulation, wave - (physics) a movement up and down or back and forth

transient - (physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load

beat - a single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations

resonance - a vibration of large amplitude produced by a relatively small vibration near the same frequency of vibration as the natural frequency of the resonating system

sympathetic vibration - (physics) vibration produced by resonance

periodic event, recurrent event - an event that recurs at intervals

cardiac cycle - 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"

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

pass - one complete cycle of operations (as by a computer); "it was not possible to complete the computation in a single pass"

menstrual cycle - 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"