[1] : The Collaborative International Dictionary of English v.0.48

concussion \concus"sion\, n. l. concussio, fr. concutere,
   concussum, to shake violenty; con- + quatere to shake. see
   cashier, quash.
   1. 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

   2. 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.
      1913 webster

   3. civil law the unlawful forcing of another by threats of
      violence to yield up something of value.
      1913 webster

            then concussion, rapine, pilleries,
            their catalogue of accusations fill.  --daniel.
      1913 webster

   concussion fuse mil., one that is ignited by the
      concussion of the shell when it strikes.

   syn: see shock.
        1913 webster
see also:
cashier quash concussion fuse shock 

[2] : WordNet (r) 2.0

concussion
     n 1: injury to the brain caused by a blow; usually resulting in
          loss of consciousness
     2: any violent blow

[3] : Moby Thesaurus II by Grady Ward, 1.0

88 moby thesaurus words for "concussion":
   abrasion, appulse, beating, blemish, blow, break, brunt, buffeting,
   bulldozing, bulling, bump, burn, cannon, carambole, carom, chafe,
   check, chip, clash, clip, clout, collision, crack, crack-up,
   crackle, crash, craze, crump, crunch, cut, encounter, flash burn,
   fracture, fray, frazzle, gall, gash, hammering, hurt, impact,
   impingement, incision, injury, jar, jarring, jolt, jolting,
   laceration, lesion, mauling, meeting, mortal wound, mutilation,
   onslaught, percussion, pounding, puncture, ramming, rent,
   repercussion, rip, run, rupture, scald, scorch, scrape, scratch,
   scuff, second-degree burn, shaking, shock, sideswipe, slash,
   sledgehammering, smash, smash-up, smashing, sore, stab, stab wound,
   tear, third-degree burn, thrusting, trauma, whomp, wound,
   wounds immedicable, wrench

[4] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

concussion, civ. law. the unlawful forcing of another by threats of violence 
to give something of value. it differs from robbery in this, that in robbery 
the thing is taken by force, while in concussion it is obtained by 
threatened violence. hein. lec. el, sec. 1071 

Concussion >> C Words
Concussion, definition of term: Concussion
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