n.
Pronunciation: ə - ' gre-sh ə n
Function: noun
Etymology: Latin aggression-, aggressio attack, from aggredi to attack, from ad- + gradi to step, go ― more at GRADE
Date: 1611
1 : a forceful action or procedure (as an unprovoked attack) especially when intended to dominate or master
2 : the practice of making attacks or encroachments especially : unprovoked violation by one country of the territorial integrity of another
3 : hostile, injurious, or destructive behavior or outlook especially when caused by frustration