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[kuh n-kuhsh-uh n] /kənˈkʌʃ ən/

Pathology. injury to the brain or spinal cord due to jarring from a blow, fall, or the like.
shock caused by the impact of a collision, blow, etc.
the act of violently shaking or jarring.
a jarring of the brain, caused by a blow or a fall, usually resulting in loss of consciousness
any violent shaking; jarring

c.1400, from Latin concussionem (nominative concussio) “a shaking,” noun of action from past participle stem of concutere “shake violently,” from com- “together” (see com-) + quatere “to shake” (see quash). Modern brain injury sense is from 1540s.

concussion con·cus·sion (kən-kŭsh’ən)

An injury to a soft structure, especially the brain, produced by a violent blow or impact and followed by a temporary, sometimes prolonged, loss of function. A concussion of the brain results in transient loss of consciousness or memory.


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