concussion

Etymology

From concuss + -ion From the Latin concussio.

noun

  1. A violent collision or shock.
  2. (uncountable in Commonwealth, countable in Canada, US) An injury to part of the body, most especially the brain, caused by a violent blow, followed by loss of function.
  3. (obsolete, law, civil law) The unlawful forcing of another by threats of violence to yield up something of value.

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