American English

Definition of concussion noun from the Oxford Advanced American Dictionary

 

concussion

 noun
noun
NAmE//kənˈkʌʃn//
 
 
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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 He was taken to the hospital with a concussion.
See the Oxford Advanced Learner's Dictionary entry: concussion