a person, group, or nation that attacks first or initiates hostilities; an assailant or invader.

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. 2014.
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World English Dictionary
aggression (əˈɡrɛʃən)
1.  an attack or harmful action, esp an unprovoked attack by one country against another
2.  any offensive activity, practice, etc: an aggression against personal liberty
3.  psychol a hostile or destructive mental attitude or behaviour
[C17: from Latin aggression-, from aggrēdi to attack]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1670s, from L. aggressor, agent noun from aggredi (see aggression).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There is big a difference between being the sole aggressor and being the one party involved in certain conflicts.
And if school officials get a reaction from the aggressor, it isn't a desired one.
When the aggressor exceeds your personal limits, however, you need to take a stand.
Peace officers shall make reasonable efforts to identify the dominant aggressor in any incident.
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