Definition of aggressor noun from the Oxford Advanced Learner's Dictionary

 

aggressor

 noun
noun
BrE BrE//əˈɡresə(r)//
 
; NAmE NAmE//əˈɡresər//
 
 
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a person, country, etc. that attacks first They are seen as the aggressors in the civil war. Word Origin mid 17th cent.: from late Latin, from aggredi ‘to attack’ from ad- ‘towards’ + gradi ‘proceed, walk’.
See the Oxford Advanced American Dictionary entry: aggressor