aggression /əgresh′ən/ [L, aggressio, to attack] , a forceful behavior, action, or attitude that is expressed physically, verbally, or symbolically. It may arise from innate drives or occur as a defense mechanism, often resulting from a threatened ego. It is manifested by either constructive or destructive acts directed toward oneself or against others. Kinds include constructive aggression, destructive aggression, inward aggression.
