aggressor

  1. someone who attacks
  2. a confident assertive person who acts as instigator

Aggressor

• (n.) The person who first attacks or makes an aggression; he who begins hostility or a quarrel; an assailant.
Found on http://thinkexist.com/dictionary/meaning/aggressor/

Aggressor

Ag¬∑gres'sor noun [ Latin : confer French 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. »
Found on http://www.encyclo.co.uk/webster/A/43

aggressor

[n] - a confident assertive person who acts as instigator
Found on http://www.webdictionary.co.uk/definition.php?query=aggressor
No exact match found