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.
Although government officials have claimed that Good and Pretti were both aggressors in their altercations, footage captured by bystanders appeared to contradict those claims. Malia Mendez, Los Angeles Times, 28 Jan. 2026 That allowed the drone to locate and follow the aggressor aircraft without revealing its own position. Sujita Sinha, Interesting Engineering, 27 Jan. 2026 Unlike radar, this allowed the drone to detect and track the heat signature of the aggressor without revealing its position as would be the case with radar. New Atlas, 26 Jan. 2026 The nation’s rival then wasn’t China or Russia but Germany, the aggressor in World War I. Karissa Waddick, USA Today, 24 Jan. 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 3 Feb. 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

Last Updated: - Updated example sentences
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