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aggressor

[uh-gres-er] /əˈgrɛs ər/
noun
1.
a person, group, or nation that attacks first or initiates hostilities; an assailant or invader.
Origin of aggressor
1670-1680
1670-80; < Late Latin, Latin aggred- (stem of aggredī to attack; see aggress) + -tor -tor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Origin and History for aggressor
n.

1670s, from Latin aggressor, agent noun from aggredi (see aggression).

Online Etymology Dictionary, © 2010 Douglas Harper
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