Etymology
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concussion (n.)

c. 1400, "a bruising, contusion (to the head)," from Latin concussionem (nominative concussio) "a shaking, an earthquake," noun of action from past-participle stem of concutere "shake violently," from assimilated form of com "with, together" (see con-) + quatere "to shake" (see quash).

From late 15c. as "act of shaking or agitation," especially by impact of another body; from 1540s as "brain injury caused by a fall or blow."

updated on March 01, 2018

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Definitions of concussion from WordNet

concussion (n.)
injury to the brain caused by a blow; usually resulting in loss of consciousness;
concussion (n.)
any violent blow;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.