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[im-puhls] /ˈɪm pʌls/
the influence of a particular feeling, mental state, etc.:
to act under a generous impulse; to strike out at someone from an angry impulse.
sudden, involuntary inclination prompting to action:
to be swayed by impulse.
an instance of this.
a psychic drive or instinctual urge.
an impelling action or force, driving onward or inducing motion.
the effect of an impelling force; motion induced; impetus given.
Physiology. a progressive wave of excitation over a nerve or muscle fiber, having either a stimulating or inhibitory effect.
Mechanics. the product of the average force acting upon a body and the time during which it acts, equivalent to the change in the momentum of the body produced by such a force.
Electricity. a single, usually sudden, flow of current in one direction.
marked by or acting on impulse:
an impulse buyer.
bought or acquired on impulse:
To reduce expenses, shun impulse items when shopping.
Origin of impulse
1640-50; < Latin impulsus pressure, impulse, equivalent to im- im-1 + pul- (variant stem of pellere to push) + -sus, variant of -tus suffix of v. action Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for impulse
Contemporary Examples
Historical Examples
  • The impulse that had prompted him to hail her now prompted wild words.

    The Spenders Harry Leon Wilson
  • Let her think that your own impulse leads you, and then she will yield.

    Malbone Thomas Wentworth Higginson
  • Hope asked no questions, and hardly felt the impulse to inquire what had happened.

    Malbone Thomas Wentworth Higginson
  • All at once an impulse of yielding which was really freedom came to her.

  • The impulse of one billiard-ball is attended with motion in the second.

British Dictionary definitions for impulse


an impelling force or motion; thrust; impetus
a sudden desire, whim, or inclination: I bought it on an impulse
an instinctive drive; urge
tendency; current; trend
  1. the product of the average magnitude of a force acting on a body and the time for which it acts
  2. the change in the momentum of a body as a result of a force acting upon it for a short period of time
(physiol) See nerve impulse
(electronics) a less common word for pulse1 (sense 2)
on impulse, spontaneously or impulsively
Word Origin
C17: from Latin impulsus a pushing against, incitement, from impellere to strike against; see impel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for impulse

early 15c., "an act of impelling, a thrust, push," from Latin impulsus "a push against, pressure, shock," also "incitement, instigation, impulse," past participle of impellere (see impel). Meaning "stimulus in the mind arising from some state or feeling" first recorded 1640s.

Online Etymology Dictionary, © 2010 Douglas Harper
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impulse in Medicine

impulse im·pulse (ĭm'pŭls')

  1. A sudden pushing or driving force.

  2. A sudden wish or urge that prompts an unpremeditated act or feeling; an abrupt inclination.

  3. The electrochemical transmission of a signal along a nerve fiber that produces an excitatory or inhibitory response at a target tissue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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impulse in Science
  1. A sudden flow of electrical current in one direction.

  2. An electrical signal traveling along the axon of a neuron. Nerve impulses excite or inhibit activity in other neurons or in the tissues of the body, such as muscles and glands.

  3. The change of momentum of a body or physical system over a time interval in classical mechanics, equal to the force applied times the length of the time interval over which it is applied.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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