The act of shaking together; a violent shock, impact, or the resulting injury to the brain.
From Latin 'concussatio,' noun form of 'concutere' (to shake together). The word emerged in medical contexts to describe both the action of violent shaking and its effects on the body, particularly the head and brain.
Medieval and Renaissance doctors had to invent terminology to describe invisible injuries like concussions—words like 'concussation' show how language develops to explain medical phenomena we only fully understand with modern imaging!
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