/ kənˈkʌʃn; NAmE / noun
[ U ] (This word is only [C] in AmE .) a temporary loss of consciousness caused by a blow to the head; the effects of a severe blow to the head such as confusion and temporary loss of physical and mental abilities :
( BrE )
He was taken to hospital with concussion.
( NAmE )
He was taken to the hospital with a concussion.
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WORD ORIGIN
late Middle English : from Latin concussio(n-) , from the verb concutere dash together, shake, from con- together + quatere shake.