the quality of being bold and enterprising aggression: a feeling of hostility that arouses thoughts of attack a natural disposition to be hostile In psychology, as well as other social and behavioral [..]

the propensity toward assertiveness, cultural control, intimidating actions, and violence. It might trigger a temporary alteration in one's actions or personality traits

aggressiveness (pop)

(n) the quality of being bold and enterprising(n) a feeling of hostility that arouses thoughts of attack(n) a natural disposition to be hostile

The tendency for an animal to attack.

J. E. van der Plank (Disease resistance in plants, 1968, New York & London, Academic Press) recommended that races of a pathogen that differ in the severity of their pathological effects but do no [..]

The quality of being aggressive (= characterised by aggression, militant, enterprising, spreading with vigour, chemically active, variable and adaptable). (18 Nov 1997)