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From concuss +‎ -ion From the Latin concussio.


  • IPA(key): /kənˈkʌʃən/, /kənˈkʌʃn/
  • (file)


concussion (countable and uncountable, plural concussions)

  1. A violent collision or shock.
    • 1626, Francis Bacon, Sylva Sylvarum, Or, A Naturall Historie: In Ten Centuries
      It is believed that great ringing of bells, in populous cities, hath dissipated pestilent air; which may be from the concussion of the air.
  2. (uncountable in Commonwealth of Nations, 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. (law, civil law) The unlawful forcing of another by threats of violence to yield up something of value.
    • 1595, Samuel Daniel, The First Four Books of the Civil Wars
      Then Concussion, Rapine, Pillories, / Their Catalogue of Accusations fill.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for concussion in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)

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concussion f (plural concussions)

  1. political corruption, misappropriation

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