What does concussion mean or Definition?

Looking for the meaning or definition of the word concussion? That's all it means.

List of meaning for concussion

the result of a really hard hit to the head, causing a temperary loss of function

injury to the brain caused by a blow; usually resulting in loss of consciousness

any violent blow

the concussion of the two football players sent them both to the ground

the theory that such a concussion, by a giant asteroid or comet millions of years ago, led to the extinction of the dinosaurs

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