Pronunciation: (u-gresh'un), [key]
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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