Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: concussio, from concutere 'to shake violently', from com- ( COM-) + quatere 'to shake'

concussion

 noun
     
Related topics: Illness and Disability
con‧cus‧sion
1MI [uncountable] British English [countable] American English a small amount of damage to the brain that makes you lose consciousness or feel sick for a short time, usually caused by something hitting your head
with (a) concussion
He was rushed into hospital with concussion.
I had a concussion and a lot of scrapes and bruises.
2 [countable usually singular] a violent shaking movement, caused by the very loud sound of something such as an explosion:
The ground shuddered and heaved with the concussion of the blast.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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