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 survey does not address who the aggressors are, though girls were more likely to note that their bullies were perceived to have the ability to influence others. Sally Ho, Houston Chronicle, "US cyberbullying is rising, and girls are bearing the brunt," 26 July 2019 The survey doesn’t address who the aggressors are, though girls were more likely to note that their bullies were perceived to have the ability to influence others. Washington Post, "Girls report more harassment amid rise in US cyberbullying," 26 July 2019 Taariq Vanegas, 21, claims his accuser was the aggressor and that the college in Northfield, Minn., failed to give him a fair disciplinary hearing. Josh Verges, Twin Cities, "Carleton College football player expelled for sexual assault after secret society initiation sues college," 26 July 2019 Responding officers determined that the man was actually the primary aggressor and arrested him for domestic violence., "Panera customer disgusted by man’s personal sex act: South Euclid Police Blotter," 24 July 2019 In this latest sighting, the F-117A sported a blocky, white, gray, and black paint job similar to those used by the Air Force’s aggressor squadrons, which train to replicate enemy weapons and tactics. Kyle Mizokami, Popular Mechanics, "The Retired F-117A Nighthawk Is the Desert," 15 July 2019 The Timbers were the aggressor on the night, controlling the bulk of the possession and spending most the night in Orlando’s half. Caitlin Murray | For The Oregonian/oregonlive,, "Late goal helps Portland Timbers salvage a point in 1-1 draw with Orlando City SC," 18 July 2019 Outside of 18 minutes in Game 2 and the first quarter in Game 4, Toronto has been the aggressor, using superior in-game adjustments, depth, shooting and speed to force a dynasty to the brink. Connor Letourneau,, "What must Warriors do for NBA Finals comeback against Raptors?," 8 June 2019 Each party has a narrative around these events in which the other was the aggressor. Michael Brendan Dougherty, National Review, "Can Joe Biden Be America’s New Great Compromiser?," 21 June 2019

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

6 Sep 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).


to make a temporary encampment

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