the world > movement > motion in specific manner > alternating or reciprocating motion > pulsation > [noun] > a pulsation (3)
Each of a rhythmical succession of strokes or undulations; a single vibration or wave; a beat.
A regular pulsation; a steady rhythmic pulsating or vibrating sound.
gen. As a count noun (usually in plural): a beat, a vibration, an undulation; = pulse, n.2 4a.