American Heritage Dictionary
(2)
Century Dictionary
(5)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
NOWINSKI: Well most athletes don't even know what a concussion is and what the damage can cause.— CNN Transcript Jan 21, 2007
We heard like a concussion, and for a few seconds it was quite scary.— CNN Transcript Aug 9, 2007
As far as Clement himself, you know, they talk about something known as a concussion.— CNN Transcript Jul 28, 2005
Concussion has been looked up 306 times, favorited 0 times, listed 4 times, and commented on 0 times.

American Heritage Dictionary (1)
Century Dictionary (1)
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