con·cus·sion (k n-k sh n)n. 1. A violent jarring; a shock. See Synonyms at collision. 2. An injury to an organ, especially the brain, produced by a violent blow and followed by a temporary or prolonged loss of function. [Middle English concussioun, bruise, contusion, from Latin concussi  , concussin-, concussion, from concussus, past participle of concutere, to strike together; see concuss.]con·cus sive (-ks v) adj.con·cus sive·ly adv. |
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