concussion

UK: /kənˈkʌʃ^ən/ US: /kənˈkʌʃən/ ,(kən kush′ən)

WordReference Random House Learner's Dictionary of American English © 2025

con•cus•sion /kənˈkʌʃən/   n. [countable]

1. Pathology injury to the brain due to a blow or a fall:
   He suffered a mild concussion in the football game.
2. the act or action of violently shaking or jarring:
   concussions from the huge mortar shells.

con•cus•sive /kənˈkʌsɪv/  adj. 

WordReference Random House Unabridged Dictionary of American English © 2025

con•cus•sion  (kən kush′ən), n. 

1. Pathology injury to the brain or spinal cord due to jarring from a blow, fall, or the like.
2. shock caused by the impact of a collision, blow, etc.
3. the act of violently shaking or jarring.

• Latin concussiōn- (stem of concussiō) a shaking. See concuss, -ion
• 1350–1400; Middle English

con•cus′sion•al, con•cus•sant  (kən kus′ənt), adj.  con•cus′sive, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

concussion / kənˈkʌʃən/ noun

1. a jarring of the brain, caused by a blow or a fall, usually resulting in loss of consciousness
2. any violent shaking; jarring