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[uh-gres-er] /əˈgrɛs ər/
a person, group, or nation that attacks first or initiates hostilities; an assailant or invader.
Origin of aggressor
1670-80; < Late Latin, Latin aggred- (stem of aggredī to attack; see aggress) + -tor -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for aggressor
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Historical Examples
  • I therefore decided to stay and play the rôle of the aggressor, although I had nothing—not even a lance—with which to fight.

    My Attainment of the Pole Frederick A. Cook
  • Shall not our souls also sue for damages against its aggressor?

    Mary, Mary James Stephens
  • The aggressor being well armed, proved too powerful for the native.

  • Anyway, he began to get the worst of it, which served him right, as he was the aggressor.

    A Tale of Three Lions H. Rider Haggard
  • It was not strong enough to withstand the collision and the aggressor in the fight barely kept his balance as the wood broke.

    A Man of Two Countries Alice Harriman
Word Origin and History for aggressor

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

Online Etymology Dictionary, © 2010 Douglas Harper
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