concussion

[kuhn-kuhsh-uhn]
noun
1.
Pathology. injury to the brain or spinal cord due to jarring from a blow, fall, or the like.
2.
shock caused by the impact of a collision, blow, etc.
3.
the act of violently shaking or jarring.

Origin:
1350–1400; Middle English < Latin concussiōn- (stem of concussiō) a shaking. See concuss, -ion

concussional, concussant [kuhn-kuhs-uhnt] , adjective
concussive, adjective
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World English Dictionary
concussion (kənˈkʌʃən)
 
n
1.  a jarring of the brain, caused by a blow or a fall, usually resulting in loss of consciousness
2.  any violent shaking; jarring
 
con'cussive
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

concussion
1490, from L. concussionem (nom. concussio), pp. of concutere "shake violently," from com- "together" + quatere "to shake." Modern brain injury sense is from 1540s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

concussion con·cus·sion (kən-kŭsh'ən)
n.

  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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American Heritage
Science Dictionary
concussion   (kən-kŭsh'ən)  Pronunciation Key 
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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Example sentences
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.
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