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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.
Contemporary Examples

But past aggressions against Hungary, Czechoslovakia, and Georgia were plainly Illegal as well.
Obama’s All Eisenhower On Russia Robert Shrum March 9, 2014

Historical Examples

You tell me the Quakers are charged on your side of the water with being, by their aggressions, the cause of the war.
Benjamin Franklin Frank Luther Mott

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

Now it seems you have suddenly become afraid of her aggressions, and are alarmed lest she should swallow up all modern society.
The Catholic World, Vol. X, October 1869 Various

He maintained order, and put a term to the aggressions of the Indians.
The Nation in a Nutshell George Makepeace Towle

Still the encroachments and aggressions of Massachusetts and Connecticut continued.
A short history of Rhode Island George Washington Greene

But they were not far distant, and soon were presented by the British aggressions.
John Quincy Adams John. T. Morse

Britain, twice humbled for her aggressions, has at length been taught to respect us.
The Bay State Monthly, Volume I. No. VI. June, 1884 Various

War can come only by the willful acts and aggressions of others.
World’s War Events, Vol. II Various

The Administration had found it necessary to order the troops on the frontier to be in readiness to repel future aggressions.
Union and Democracy Allen Johnson

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

aggression ag·gres·sion (ə-grěsh’ən)
n.
Hostile or destructive behavior or actions.
aggression
(ə-grěsh’ən)
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.