concussion

noun

con·​cus·​sion kən-ˈkə-shən 

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

The football player suffered a concussion.

b

: a hard blow or collision

2

: agitation, shaking

The concussion from the explosion was felt 12 miles away.

concussive

kən-ˈkə-siv 

adjective

Synonyms

• collision
• shock
• crash

Choose the Right Synonym for concussion

impact, collision, shock, concussion mean a forceful, even violent contact between two or more things.

impact may be used to imply contact between two things, at least one of which is impelled toward the other.

the glass shattered on impact with the floor

collision implies the coming together of two or more things with such force that both or all are damaged or their progress is severely impeded.

the collision damaged the vehicle

shock often denotes the effect produced by a collision and carries the suggestion of something that strikes or hits with force.

the shock of falling rocks

concussion when not in technical use, often suggests the shattering, disrupting, or weakening effects of a collision, explosion, or blow.

bystanders felt the concussion of the blast

Examples of concussion in a Sentence

She suffered a severe concussion after falling on the ice.

He went to hospital with concussion.

Recent Examples on the Web

According to Colts beat reporter Jamed Boyd, Pierce has not been cleared to be taken off concussion protocol despite practicing in full this week, ruling him out for Sunday's game. —Reice Shipley, MSNBC Newsweek, 3 Oct. 2025

Last season, the Giants offense had to try to function without Nabers for a couple of games, as the then-rookie dealt with a concussion. —Charlotte Carroll, New York Times, 2 Oct. 2025

New York Jets star Justin Fields is expected to return to his QB duties after missing his team’s previous game in concussion protocol after a Week 2 game against the Buffalo Bills. —Armando Tinoco, Deadline, 29 Sep. 2025

As of Monday afternoon, Mickey was in concussion protocol but already studying Notre Dame video at the team’s facility, the coaches said, with the Broncos set to travel to South Bend, Indiana, to take on the Fighting Irish this weekend. —Shaun Goodwin, Idaho Statesman, 29 Sep. 2025

Word History

Etymology

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

First Known Use

14th century, in the meaning defined at sense 1a

Phrases Containing concussion

• concussion grenade

Rhymes for concussion

• discussion
• percussion
• belorussian
• repercussion
• byelorussian
• kushan
• russian

Kids Definition

concussion

noun

con·​cus·​sion kən-ˈkəsh-ən 

1

: a violent uneven motion

2

: a hard blow or collision

3

: bodily injury especially of the brain resulting from a sudden sharp jar (as from a blow)

concussive

-ˈkəs-iv 

adjective

Medical Definition

concussion

noun

con·​cus·​sion kən-ˈkəsh-ən 

1

: a hard blow or collision

2

: a condition resulting from the stunning, damaging, or shattering effects of a hard blow

especially : a jarring injury of the brain resulting in disturbance of cerebral function and sometimes marked by permanent damage

concussive

-ˈkəs-iv 

adjective