GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Concussion , n. [L. concussio, fr. concutere, concussum, to shake violenty; con- + quatere to shake. See Cashier, Quash.]
   A shaking or agitation; a shock; caused by the collision of two bodies.
   1913 Webster
   It is believed that great ringing of bells, in populous cities, hath dissipated pestilent air; which may be from the concussion of the air.
   Bacon.
   
   1913 Webster
   (Med.) A condition of lowered functional activity, without visible structural change, produced in an organ by a shock, as by fall or blow; as, a concussion of the brain.
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   (Civil Law) The unlawful forcing of another by threats of violence to yield up something of value.
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   Then concussion, rapine, pilleries,
   Their catalogue of accusations fill.
   Daniel.
   
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   Concussion fuse (Mil.), one that is ignited by the concussion of the shell when it strikes.
   Syn. -- See Shock.
   1913 Webster