pulsation
noun.
(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
the pulsations seemed to be coming from a star
Synonym: impulse, pulse, pulsing
noun.
a periodically recurring phenomenon that alternately increases and decreases some quantity
noun.
the rhythmic contraction and expansion of the arteries with each beat of the heart
he could feel the beat of her heart
Synonym: beat, heartbeat, pulse