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

When passions are enflamed, people will be less willing to sit down and negotiate with someone they view as an aggressor.
Venezuela Burns, Body Count Rises Juan Nagel March 15, 2014

Davis begins the film, punched by an aggressor into the gutter and ends it the same way.
Why No Oscar Love For ‘Inside Llewyn Davis’? Tim Teeman January 19, 2014

Everyone is trying to prove their point that one is the aggressor and one is the victim.
Israel and Gaza Battle Twitter War Over Rocket Attacks Mike Giglio November 16, 2012

Gladwell claims that the officer was trying to restrain his dogs while Gadsden was the aggressor.
Malcolm Gladwell In Five Minutes: What to Know to Pretend You’ve Read the New Book Thomas Flynn October 4, 2013

Hock, the source says, was the aggressor who clocked Casiraghi first.
Royal Showdown in New York Court Lizzie Crocker February 3, 2013

Historical Examples

I therefore decided to stay and play the rôle of the aggressor, although I had nothing—not even a lance—with which to fight.
My Attainment of the Pole Frederick A. Cook

Three times the aggressor was knocked entirely off his feet.
Blazed Trail Stories Stewart Edward White

The aggressor being well armed, proved too powerful for the native.
Stories About Indians Anonymous

Shall not our souls also sue for damages against its aggressor?
Mary, Mary James Stephens

It was not strong enough to withstand the collision and the aggressor in the fight barely kept his balance as the wood broke.
A Man of Two Countries Alice Harriman


1670s, from Latin aggressor, agent noun from aggredi (see aggression).

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    to oppress or wrong grievously; injure by injustice. to afflict with pain, anxiety, etc. Historical Examples No natives know so well how to aggrieve and be unpleasant to travellers. In Darkest Africa, Vol. 2; or, The quest, rescue and retreat of Emin, governor of Equatoria Henry Morton Stanley The mighty mother cannot find it in […]

  • Aggrieved

    wronged, offended, or injured: He felt himself aggrieved. Law. deprived of legal rights or claims. troubled; worried; disturbed; unhappy. to oppress or wrong grievously; injure by injustice. to afflict with pain, anxiety, etc. Contemporary Examples John definitely did, and in the 1970s wrote an aggrieved, whiny book making the claim. The Wonderful, Horrible Life of […]

  • Aggrievement

    to oppress or wrong grievously; injure by injustice. to afflict with pain, anxiety, etc. Historical Examples “I did think you would have helped me, Bunny,” Delushy cried, with aggrievement. The Maid of Sker Richard Doddridge Blackmore There was a tone of injury and aggrievement in his talk of the bear’s ingratitude. Eben Holden Irving Bacheller […]

  • Aggro

    aggressiveness, especially that of an urban youth gang or gang member. trouble; irritation. noun (Brit, slang) aggressive behaviour, esp by youths in a gang modifier Aggravated or annoyed: He got aggro when the interview took longer than he planned

  • Agh.

    (def 3).

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