aggressor

noun

ag·​gres·​sor ə-ˈgre-sər How to pronounce aggressor (audio)
Synonyms of aggressornext
: one that commits or practices aggression

Examples of aggressor in a Sentence

Each country accused the other of being the aggressor. a group of smaller states had formed an alliance to deter potential aggressors
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Rizvi joined opener Pathum Nissanka, who was the initial aggressor in their 66-run stand. ABC News, 4 Apr. 2026 Trump has made our country the aggressor. Voice Of The People, New York Daily News, 3 Apr. 2026 However, as Rothbard lays out, one of the most important concepts that often gets lost or forgotten in the fog of war is that violence may only be used to resist or punish the aggressor. Connor Okeeffe, Oc Register, 29 Mar. 2026 Two defense witnesses, including the doctor and a receptionist, supported her account, saying Ellis appeared to be the aggressor. Nancy Dillon, Rolling Stone, 26 Mar. 2026 See All Example Sentences for aggressor

Word History

Etymology

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

First Known Use

1585, in the meaning defined above

Time Traveler
The first known use of aggressor was in 1585

Browse Nearby Words

Cite this Entry

“Aggressor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aggressor. Accessed 8 Apr. 2026.

Kids Definition

aggressor

noun
ag·​gres·​sor ə-ˈgres-ər How to pronounce aggressor (audio)
: a person or country that attacks without reasonable cause

Medical Definition

aggressor

noun
ag·​gres·​sor ə-ˈgres-ər How to pronounce aggressor (audio)
: one who exhibits aggression

More from Merriam-Webster on aggressor

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster