aggression

Aggression is defined as an unprovoked attack or harmful action against another.

(noun)

An example of an aggression is a dog barking and chasing after another dog in an effort to attack.

The definition of aggression refers to the practice of being offensive or prone to attacking others.

(noun)

An example of someone who is prone to bouts of aggression would be someone who is routinely starting fights.

See aggression in Webster's New World College Dictionary

noun

an unprovoked attack or warlike act; specif., the use of armed force by a state in violation of its international obligations
the practice or habit of being aggressive or quarrelsome
Psychiatry forceful, attacking behavior, either constructively self-assertive and self-protective or destructively hostile to others or to oneself

Origin: Fr < L aggressio: see aggress

See aggression in American Heritage Dictionary 4

noun