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

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. A shaking or agitation; a shock; caused by the collision of two bodies.
  • n. A condition of lowered functional activity, without visible structural change, produced in an organ by a shock, as by fall or blow.
  • n. The unlawful forcing of another by threats of violence to yield up something of value.

from The Century Dictionary and Cyclopedia

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

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

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


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.


  • 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.

  • 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

  • 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 :

  • Texans: Rookie cornerback Glover Quin will miss Sunday's game against Jacksonville with what he calls concussion symptoms.

    Statesman - AP Sports

  • Medical groups want to get the message "to the athletes, their parents and their coaches that a concussion is not just a ding, or getting your bell rung, but it is an injury to the brain," said Dr. Mark Halstead of Washington University, who co-authored an earlier concussion report for the American Academy of Pediatrics.

    Concussions In Sports: Athletes' Head Injuries Should Be Reviewed, Experts Say

  • Merchant, meantime, sat out the Louisiana Tech game because of a concussion from the previous week.

    Matt Molloy, Emmett Merchant expected to play


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