ag·​gres·​sor | \ ə-ˈgre-sər How to pronounce aggressor (audio) \

Definition of aggressor

: one that commits or practices aggression

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Synonyms for aggressor


invader, raider

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Examples of aggressor in a Sentence

Each country accused the other of being the aggressor. these pocket-size states had formed an alliance to deter potential aggressors

Recent Examples on the Web

The service also wants to purchase 22 F-5 Tiger IIs, recently retired from the Swiss Air Force, to act as aggressor aircraft for the U.S. Navy and Marine Corps fighter pilots to train against. Kyle Mizokami, Popular Mechanics, "The Pentagon’s 2020 Budget Asks for Nearly 380 Aircraft, But One Buy Is Raising Eyebrows," 13 Mar. 2019 This becomes especially hard when a parent turns into an aggressor herself. Mira Jacob, Redbook, "Navigating a World of Bullies," 19 Sep. 2017 Although the fraternity expelled the aggressor in the homosexual affair, Williams was allowed to stay. Greg Garrison,, "Southern playwright Tennessee Williams majored in journalism at Mizzou," 26 Mar. 2018 Houston was the aggressor in Game 2, as its role players stepped up in a big way on both ends of the floor. Rohan Nadkarni,, "P.J. Tucker and Houston's Role Players Step Up as the Rockets Demolish the Warriors," 17 May 2018 While the teams split the faceoffs in the first period, Columbus was the aggressor early, outshooting the Golden Knights 14-13 and controlling the tempo while peppering Fleury with several opportunities. USA TODAY, "Karlsson scores 2 vs former team, Knights top Columbus 6-3," 24 Jan. 2018 Finally, ginger defends skin against external aggressors like pollution and is paired with vitamin C to even out hyperpigmentation and further brighten skin. Tess Garcia, Teen Vogue, "Glow Recipe Announced the Upcoming Launch of a Target Line Called Sweet Chef," 27 Dec. 2018 Miller claimed that Spencer was the initial physical aggressor, after his unsuccessful come-on. Chris Harris,, "Man Claims He Killed Neighbor in Self-Defense After Victim Tried to Come Onto Him: 'I’m Not Gay'," 30 Apr. 2018 An anonymous tip line designed to find potential aggressors might also receive calls about drug use, or a suicide. Lara Sorokanich, Popular Mechanics, "The Popular Mechanics Guide to Safer Schools," 1 Aug. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'aggressor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of aggressor

1585, in the meaning defined above

History and Etymology for aggressor

borrowed from Latin, "attacker, assailant," from aggredī, adgredī "to approach, attack" + -tor, agent suffix — more at aggress

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Statistics for aggressor

Last Updated

17 May 2019

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Time Traveler for aggressor

The first known use of aggressor was in 1585

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More Definitions for aggressor



English Language Learners Definition of aggressor

: a person or country that attacks another : a person or country that starts a fight or war


ag·​gres·​sor | \ ə-ˈgre-sər How to pronounce aggressor (audio) \

Kids Definition of aggressor

: a person or a country that engages in hostile action without reasonable cause


ag·​gres·​sor | \ ə-ˈgres-ər How to pronounce aggressor (audio) \

Medical Definition of aggressor

: one who exhibits aggression

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Comments on aggressor

What made you want to look up aggressor? Please tell us where you read or heard it (including the quote, if possible).


something valued as if it were money

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