the action of a state in violating by force the rights of another state, particularly its territorial rights; an unprovoked offensive, attack, invasion, or the like: The army is prepared to stop any foreign aggression.
any offensive action, attack, or procedure; an inroad or encroachment: an aggression upon one's rights.
the practice of making assaults or attacks; offensive action in general.
Psychiatry. overt or suppressed hostility, either innate or resulting from continued frustration and directed outward or against oneself.

Origin of aggression

1605–15; < Latin aggressiōn- (stem of aggressiō), equivalent to aggress(us) (see aggress) + -iōn- -ion
Related formsan·ti·ag·gres·sion, adjectivecoun·ter·ag·gres·sion, nounpre·ag·gres·sion, noun
Can be confusedaggression egression

Antonyms for aggression Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for aggressions

Contemporary Examples of aggressions

Historical Examples of aggressions

  • He maintained order, and put a term to the aggressions of the Indians.

    The Nation in a Nutshell

    George Makepeace Towle

  • Their aggressions on the coast settlers have been frequent for centuries past.

  • But they were not far distant, and soon were presented by the British aggressions.

    John Quincy Adams

    John. T. Morse

  • Hannibal, it is true, had commenced his aggressions at Saguntum, in Spain.


    Jacob Abbott

  • Their vengeance had been excited by aggressions made on them by the whites.

British Dictionary definitions for aggressions



an attack or harmful action, esp an unprovoked attack by one country against another
any offensive activity, practice, etcan aggression against personal liberty
psychol a hostile or destructive mental attitude or behaviour
Derived Formsaggressor (əˈɡrɛsə), noun

Word Origin for aggression

C17: from Latin aggression-, from aggrēdi to attack
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for aggressions



1610s, "unprovoked attack," from French aggression (16c.), from Latin aggressionem (nominative aggressio) "a going to, an attack," noun of action from past participle stem of aggredi "to approach; attack," from ad- "to" (see ad-) + gradi (past participle gressus) "to step," from gradus "a step" (see grade). Psychological sense of "hostile or destructive behavior" first recorded 1912 in A.A. Brill's translation of Freud.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for aggressions




Hostile or destructive behavior or actions.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for aggressions



Behavior that is meant to intimidate or injure an animal of the same species or of a competing species but is not predatory. Aggression may be displayed during mating rituals or to defend territory, as by the erection of fins by fish and feathers by birds.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.