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.
The armed forces of the Islamic Republic of Iran will respond to the aggressors with authority. Jon Haworth, ABC News, 28 Feb. 2026 The Titans were the aggressor when the teams went to battle on the boards. Steve Fryer, Oc Register, 28 Feb. 2026 In Kyiv, 62-year-old art teacher Larysa Fuzik said the international community needed to put more pressure on Russia as the aggressor. Reuters, NBC news, 26 Feb. 2026 White said there was neither evidence nor trial testimony from the witness that Galvan was the first aggressor. Nick Ferraro, Twin Cities, 24 Feb. 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 6 Mar. 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

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