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aggression

[uh-gresh-uh n]
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noun
  1. 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.
  2. any offensive action, attack, or procedure; an inroad or encroachment: an aggression upon one's rights.
  3. the practice of making assaults or attacks; offensive action in general.
  4. Psychiatry. overt or suppressed hostility, either innate or resulting from continued frustration and directed outward or against oneself.
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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

1. peacefulness.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for aggression

aggression

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

Word Origin

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 aggression

n.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

aggression in Medicine

aggression

(ə-grĕshən)
n.
  1. Hostile or destructive behavior or actions.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

aggression in Science

aggression

[ə-grĕshən]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.