Ag*gres"sor (&?;), n. [L.: cf. F. agresseur.] The person who first attacks or makes an aggression; he who begins hostility or a quarrel; an assailant.

The insolence of the aggressor is usually proportioned to the tameness of the sufferer.
Ames.

• The person who first attacks or makes an aggression; he who begins hostility or a quarrel; an assailant.