Main Entry: con·cus·sion

Pronunciation: \kən-ˈkə-shən\

Function: noun

Etymology: Middle English concussioun, from Latin concussion-, concussio, from concutere to shake violently, from com- + quatere to shake

Date: 14th century

1 a : a stunning, damaging, or shattering effect from a hard blow; especially : a jarring injury of the brain resulting in disturbance of cerebral function b : a hard blow or collision
2 : agitation, shaking

synonyms see impact

— con·cus·sive \-ˈkə-siv\ adjective