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aggressor

[uh-gres-er]
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noun
  1. a person, group, or nation that attacks first or initiates hostilities; an assailant or invader.
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Origin of aggressor

1670–80; < Late Latin, Latin aggred- (stem of aggredī to attack; see aggress) + -tor -tor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for aggressor

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper