pulsation

/ˌpəl-ˈsā-shən/

Middle English pulsacioun, borrowed from Medieval Latin pulsātiōn-, pulsātiō, going back to Latin, "repeated striking, knocking (on a door)," from pulsāre "to strike with repeated blows, beat, (in passive) beat wildly (of the heart)" + -tiōn-, -tiō, suffix of verbal action

noun

  1. rhythmical throbbing or vibrating (as of an artery); also : a single beat or throb

  2. a periodically recurring alternate increase and decrease of a quantity (such as pressure, volume, or voltage)