plural concussions
: an injury to the brain that is caused by something hitting the head very hard
(US)
She suffered a severe concussion after falling on the ice.
(Brit)
He went to hospital with concussion.
Cite this Entry
“Concussion.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/concussion. Accessed 19 Jun. 2026.
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