Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A violent jarring; a shock.
  • noun An injury to an organ, especially the brain, produced by a violent blow and followed by a temporary or prolonged loss of function.

from The Century Dictionary.

  • noun The act of shaking or agitating, particularly by the stroke or impact of another body.
  • noun The state of being shaken; the shock occasioned by two bodies coming suddenly and violently into collision; shock; agitation.
  • noun In surgery, injury sustained by the brain or other viscera, as from a fall, a blow, etc.
  • noun In civil law, the act of extorting money or something of value by violence or threats of violence; extortion.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A shaking or agitation; a shock; caused by the collision of two bodies.
  • noun (Med.) A condition of lowered functional activity, without visible structural change, produced in an organ by a shock, as by fall or blow.
  • noun (Civil Law) The unlawful forcing of another by threats of violence to yield up something of value.
  • noun (Mil.) one that is ignited by the concussion of the shell when it strikes.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a violent collision or shock
  • noun an injury to part of the body, most especially the brain, caused by a violent blow, followed by loss of function

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun injury to the brain caused by a blow; usually resulting in loss of consciousness
  • noun any violent blow

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English concussioun, bruise, contusion, from Latin concussiō, concussiōn-, concussion, from concussus, past participle of concutere, to strike together; see concuss.]

Examples

  • For decades, Army award regulations used the term "concussion" for the injury, but left it to doctors or battlefield commanders to decide whether a blow to the head during combat warranted the medal.

    More Purple Hearts after Army clarifies 'concussion'

  • For decades, Army award regulations used the term "concussion" for the injury, but left it to doctors or battlefield commanders to decide whether a blow to the head during combat warranted the medal.

    More Purple Hearts after Army clarifies 'concussion'

  • Jauron had used the term concussion on Sunday to describe the injury, which Edwards suffered in the second quarter, but said that an examination will yield a better diagnosis.

    CBS 47: Local News

  • Similarly, Girardi said he expects to add plaintiffs who have what he termed "concussion syndrome."

    The Seattle Times

  • CSTE is a collaboration between Boston University Medical School and the Sports Legacy Institute that is attempting to address what it calls the "concussion crisis" in sports.

    SI.com

  • CSTE is a collaboration between Boston University Medical School and the Sports Legacy Institute that is attempting to address what it calls the "concussion crisis" in sports.

    Breaking News: CBS News

  • One study, published in 2008 by a group of Army researchers in the New England Journal of Medicine, even downplayed the role of mild TBI, suggesting that people should use the word "concussion" rather than "mild traumatic brain injury" to avoid perpetuating the belief they are suffering from a long-term injury.

    Wired Top Stories

  • CSTE is a collaboration between Boston University Medical School and the Sports Legacy Institute that is attempting to address what it calls the "concussion crisis" in sports.

    CBC | Top Stories News

  • He made one last rally, returning a week later to start against the Chicago Bears, only to be knocked out of the game, suffering what he called a concussion when he was slammed to the frigid turf.

    The Seattle Times

  • HOUSTON - Houston Texans rookie cornerback Glover Quin will miss this weekend's game against Jacksonville with what he called concussion symptoms.

    Brownsville Herald :

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