'Concussion' definitions:

Definition of 'concussion'

(from WordNet)
noun
Injury to the brain caused by a blow; usually resulting in loss of consciousness
noun
Any violent blow

Definition of 'Concussion'

From: GCIDE
  • Concussion \Con*cus"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]