ag·gres·sion

– 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.
2. any offensive action, attack, or procedure; an inroad or encroachment.
3. the practice of making assaults or attacks; offensive action in general.
4. overt or suppressed hostility, either innate or resulting from continued frustration and directed outward or against oneself.