Behavior which attacks, threatens, intimidates, or otherwise intends harm. May be physical, mental, or verbal.
Example: A man is annoyed with his spouse over a trivial matter. He raises his voice, throws an object across the room, and then hits the wall with his fist.
Grinnell, R. (2008). Aggression. Psych Central. Retrieved on April 27, 2015, from http://psychcentral.com/encyclopedia/2008/aggression/