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aggressor

American  
[uh-gres-er] / əˈgrɛs ər /

noun

  1. a person, group, or nation that attacks first or initiates hostilities; an assailant or invader.


Etymology

Origin of aggressor

1670–80; < Late Latin, Latin aggred- (stem of aggredī to attack; aggress ) + -tor -tor

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He warned this month that "any external aggressor will encounter an unbreakable resistance."

From Barron's • Mar. 29, 2026

But attorneys for the county argued in court filings that it was Seitz who was actually the aggressor.

From Los Angeles Times • Feb. 27, 2026

Will then lurches into a tut-tutting recapitulation of the French army chief of staff’s public statement that his nation’s people must accept the risk of losing their children to protect France from an unnamed aggressor.

From Salon • Dec. 20, 2025

What is disputed is which power Adolf Hitler, the war’s main aggressor, was most concerned with and which power made the biggest contribution to his defeat.

From The Wall Street Journal • Oct. 24, 2025

For the first time in modern history, major wars of aggression were stopped partly because of the revulsion felt by the citizens of the aggressor nations.

From "Cosmos" by Carl Sagan