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.

1605–15; < Latin aggressiōn- (stem of aggressiō), equivalent to aggress(us) (see aggress) + -iōn- -ion

antiaggression, adjective
counteraggression, noun
preaggression, noun

aggression, egression.

1. peacefulness. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aggression (əˈɡrɛʃən)
1.  an attack or harmful action, esp an unprovoked attack by one country against another
2.  any offensive activity, practice, etc: an aggression against personal liberty
3.  psychol a hostile or destructive mental attitude or behaviour
[C17: from Latin aggression-, from aggrēdi to attack]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1610s, "unprovoked attack," from verb aggress "to approach, to start an argument" (1570s), from Fr. aggresser, from L.L. aggressare, freq. of L. aggredi (pp. aggressus) "to approach, attack," from ad- "to" + gradi (pp. 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
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American Heritage
Medical Dictionary

aggression ag·gres·sion (ə-grěsh'ən)
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.
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American Heritage
Science Dictionary
aggression   (ə-grěsh'ən)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The only way to stop that behavior is to get their attention at the same
  intensity as their aggression.
The drug elevates aggression levels and psychotic behavior, often generating
  fierce outbursts.
Relational aggression is finding its chroniclers among more popular writers,
The groups were tested for antisocial personality disorder, psychopathy, and
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