UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˈgrɛsər/US:USA pronunciation: respellingUSA pronunciation: respelling(ə gresər)

WordReference Random House Unabridged Dictionary of American English © 2020
ag•gres•sor  (ə gresər),USA pronunciation n. 
  1. a person, group, or nation that attacks first or initiates hostilities;
    an assailant or invader.
  • Late Latin, Latin aggred- (stem of aggredī to attack; see aggress) + -tor -tor
  • 1670–80

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