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PULSATION

Definition:

[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"
Synonyms: pulsing, pulse, impulse
[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"
Synonyms: pulse, heartbeat, beat