Other forms: concussions
Concussion is a brain injury caused by a knock to the head, the brain shaken inside the skull. The footballer who stays down after a clash of heads and then cannot remember the last ten minutes.
The signs are headache, dizziness, blurred sight, feeling sick, and a fog that hangs about for days or weeks after the blow. British English says he suffered concussion with no article; American English says he had a concussion. The related words are concussed — he was concussed and taken off — and the verb concuss. Sport has turned it into a serious word with rules attached: concussion protocols, mandatory rest, return-to-play checks. It reaches beyond heads as well, since the concussion of a blast is the violent shaking of air that blows windows in.
1nounconcussionAn injury to the brain caused by a blow to the head.
“The doctor said it was a mild concussion and sent him home to rest.”
2nounviolentA violent shaking caused by an impact or an explosion.
“The concussion of the blast shattered every window on the street.”
concussion is a head injury.
Concussion arrived in English whole from the Latin concussiō. You can also read it as English parts: the verb concuss with the ending -ion that turns an action into a thing, the same shape as discuss and discussion.
Latin
concussiō
English, today
concussion
From Latin concussiō. Equivalent to concuss + ion.
Etymology from Wiktionary, CC BY-SA