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[kuh n-kuhsh-uh n] /kənˈkʌʃ ən/
Pathology. injury to the brain or spinal cord due to jarring from a blow, fall, or the like.
shock caused by the impact of a collision, blow, etc.
the act of violently shaking or jarring.
Origin of concussion
1350-1400; Middle English < Latin concussiōn- (stem of concussiō) a shaking. See concuss, -ion
Related forms
concussional, concussant
[kuh n-kuhs-uh nt] /kənˈkʌs ənt/ (Show IPA),
concussive, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for concussion
  • By his count, he had suffered the ninth concussion of his career.
  • Cracks appeared in other ancient sites as the concussion of nearby explosions rocked ancient foundations.
  • Civilians might experience these sorts of headaches after a car accident or a concussion.
  • When he didn't emerge from the locker room after halftime, team officials said he was out of the game with a concussion.
  • Research shows that the recovery period for a concussion is lengthened with each successive concussion.
  • And when that happens there is going to be a bruise of the brain and that is a concussion.
  • Rooftop concussion cannons throw in random bursts of noise and flame.
  • While the concussion is of significant concern, it appears that is all it is.
  • If the patient is generally competent, and not showing signs of concussion or confusion, they could refuse care.
  • It is the third of his career and it comes after a concussion that prematurely ended his season last year.
British Dictionary definitions for concussion


a jarring of the brain, caused by a blow or a fall, usually resulting in loss of consciousness
any violent shaking; jarring
Derived Forms
concussive, adjective
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 concussion

c.1400, from Latin concussionem (nominative concussio) "a shaking," noun of action from past participle stem of concutere "shake violently," from com- "together" (see com-) + quatere "to shake" (see quash). Modern brain injury sense is from 1540s.

Online Etymology Dictionary, © 2010 Douglas Harper
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concussion in Medicine

concussion con·cus·sion (kən-kŭsh'ən)

  1. A violent shaking or jarring.

  2. An injury to a soft structure, especially the brain, produced by a violent blow and followed by a temporary or prolonged loss of function.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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concussion in Science
An injury to a soft structure, especially the brain, produced by a violent blow or impact and followed by a temporary, sometimes prolonged, loss of function. A concussion of the brain results in transient loss of consciousness or memory.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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