concussion
B1CEFR level
25/100Rarity: fairly common
TechnicalRegister
A mild traumatic brain injury caused by a blow to the head, often with brief confusion or memory loss.
After the fall he had a headache and could not recall the event, consistent with concussion.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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