pulsation

[puhl-sey-shuhn]
noun
1.
the act of pulsating; beating or throbbing.
2.
a beat or throb, as of the pulse.
3.
vibration or undulation.
4.
a single vibration.

Origin:
1375–1425; late Middle English pulsacioun < Latin pulsātiōn- (stem of pulsātiō). See pulsate, -ion

nonpulsation, noun
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World English Dictionary
pulsation (pʌlˈseɪʃən)
 
n
1.  the act of pulsating
2.  physiol a rhythmic beating or pulsing esp of the heart or an artery

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Etymonline
Word Origin & History

pulsation
1540s, from L. pulsationem (nom. pulsatio) "a beating or striking," from pulsatus, pp. of pulsare "to beat, strike, push," freq. of pellere (pp. pulsus) "to beat, strike." Pulsate (v.) is recorded from 1741.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pulsation pul·sa·tion (pŭl-sā'shən)
n.

  1. The act of pulsating.

  2. A single beat, throb, or vibration.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Sensor stops pulsation when brush applies too much pressure.
It is an effect of the spiked light frequency pattern on the pupil causing a
  pulsation or flutter response in the pupil.
Movement from one block to the next can only occur at a particular point in the
  pulsation.
The mechanism that drives pulsation is understood to be a balance between
  opacity, photosphere temperature, and gravity.
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