Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The act of initiating hostilities or invasion.
  • n. The practice or habit of launching attacks.
  • n. Hostile or destructive behavior or actions.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The act of initiating hostilities or invasion.
  • n. The practice or habit of launching attacks.
  • n. Hostile or destructive behavior or actions.

from the GNU version of the Collaborative International Dictionary of English

  • n. The first attack, or act of hostility; the first act of injury, or first act leading to a war or a controversy; unprovoked attack; assault. “Aggressions of power.”

from The Century Dictionary and Cyclopedia

  • n. The act of proceeding to hostilities or invasion; a breach of the peace or right of another or others; an assault, inroad, or encroachment; hence, any offensive action or procedure: as, an aggression upon a country, or upon vested rights or liberties.
  • n. The practice of making assaults or attacks; offensive action in general.
  • n. Synonyms Attack, invasion, assault, encroachment, injury, offense.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the act of initiating hostilities
  • n. deliberately unfriendly behavior
  • n. a disposition to behave aggressively
  • n. a feeling of hostility that arouses thoughts of attack
  • n. violent action that is hostile and usually unprovoked

Etymologies

From French aggression, from Latin aggressio, from aggressus, past participle of aggredior ("to approach, address, attack"). (Wiktionary)

Examples

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