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Pronunciation: im'puls


  1. A sudden pushing or driving force.
  2. A sudden, often unreasoning, determination to perform some act.
  3. The action potential of a nerve fiber.

[L. im-pello, pp. -pulsus, to push against, impel (inp-)]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.