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  1. Dictionary
    Con·cus·sion
    /kənˈkəSH(ə)n/

    noun

    • 1. temporary unconsciousness or confusion caused by a blow on the head: "nothing more serious than a mild concussion" Similar temporary unconsciousnesstemporary loss of consciousnessbang on the headmild cranial trauma
    • 2. a violent shock as from a heavy blow: "the ground shuddered with the concussion of the blast" Similar forceimpactshockjarring