[ uh-gresh-uhn ]
/ əˈgrɛʃ ən /


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

ANTONYMS FOR aggression

Related forms

an·ti·ag·gres·sion, adjectivecoun·ter·ag·gres·sion, nounpre·ag·gres·sion, noun

Can be confused

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

Examples from the Web for aggressions

British Dictionary definitions for aggressions


/ (əˈɡrɛʃən) /


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 Forms

aggressor (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

Medicine definitions for aggressions


[ ə-grĕshən ]


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


[ ə-grĕshən ]

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.