aggression

noun

ag·​gres·​sion ə-ˈgre-shən 

1

: a forceful action or procedure (such as an unprovoked attack) especially when intended to dominate or master

2

: the practice of making attacks or encroachments

especially : unprovoked violation by one country of the territorial integrity of another

warned that any act of aggression could start a war

3

: hostile, injurious, or destructive behavior or outlook especially when caused by frustration

Aggression is often the expression of pent-up rage.

Synonyms of aggression

• aggressiveness
• hostility
• defiance
• fight
• belligerence

Examples of aggression in a Sentence

He has a lot of pent-up aggression.

behavior that is likely to provoke aggression

dangerous dogs showing aggression toward people

The government says that it will view any attempt to fly over its territory as an act of aggression.

Recent Examples on the Web

Even though the Canadians cannot meet Switzerland's physical aggression, their growing confidence has rattled the opponents mentally. — Marlene Lenthang, NBC news, 25 June 2026

Perhaps cowed by Concerned Parents’ aggression, the board voted in 1972 to remove from classrooms Mike Royko’s book Boss, an exposé of Chicago Mayor Richard Daley. — Literary Hub, 25 June 2026

Cody Gakpo — Netherlands/Liverpool (new entry) Gakpo can often get tunnel vision in the final third, but his aggression was finely balanced in the Netherlands’ destruction of Sweden. — Liam Twomey, New York Times, 24 June 2026

Its highly specialized strategy likely evolved to take advantage of the ant’s natural aggression and then overcome its defenses; the slingshot mechanism flings the ant from the foraging trail, reducing the risk that the spider will be swarmed by other workers, the researchers hypothesized. — Mindy Weisberger, CNN Money, 23 June 2026

Word History

Etymology

borrowed from French & Latin; French agression, going back to Middle French, "attack," borrowed from Latin aggressiōn-, aggressiō, from aggredī "to approach, attack" + -tiōn-, -tiō, suffix of action nouns — more at aggress

First Known Use

1611, in the meaning defined at sense 1

Phrases Containing aggression

• anti-aggression
• counter-aggression

Rhymes for aggression

• accession
• compression
• concession
• confession
• depression
• digression
• discretion
• expression
• impression
• obsession
• oppression
• possession

Kids Definition

aggression

noun

ag·​gres·​sion ə-ˈgresh-ən 

1

: an attack made without reasonable cause

2

: the practice of making attacks

3

: hostile or destructive behavior or outlook

Etymology

derived from Latin aggredi "to attack," from ad- "to" and gradi "to step, go"

Medical Definition

aggression

noun

ag·​gres·​sion ə-ˈgresh-ən 

: hostile, injurious, or destructive behavior or outlook