• IPA: /kənˈkʌʃən/, /kənˈkʌʃn/


  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, countable in North America) An injury to part of the body, most especially the brain, caused by a violent blow, followed by loss of function.
  3. (legal, civil law) The unlawful forcing of another by threats of violence to yield up something of value.
    • Then concussion, rapine, pilleries, / Their catalogue of accusations fill.
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