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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
Contemporary Examples
Historical Examples
  • Finally it was betwixt chance and choice that the place and hour of concussion were determined.

    Abraham Lincoln, Vol. II John T. Morse
  • He acts as if he were suffering from concussion of the brain.

  • Springing up, she would rush against the end of the car, falling all in a heap from the violence of the concussion.

  • He's suffering from concussion, but nothing more, so far as I can see.

    Border Ghost Stories Howard Pease
  • He wouldn't care to be responsible for a concussion of the brain or anything like that.

    The City of Fire Grace Livingston Hill
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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