Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

noun. when one's actions are influenced by feelings of competition, rage, or violence, thereby producing injury to, or the deterioration or conquering of people, sometimes, one's own self. Whenever the main objective is planned harm to another or deterioration of another, the actions are referred to as hostile aggression, not being the same thing as operant or instrumental aggression

AGGRESSION: "John's level of aggression toward his peers was cause for suspension from school that week."

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