Anger is a term for the emotional aspect of aggression, as a basic aspect of the stress response in animals in which a perceived aggravating stimulus "provokes" a counterresponse which is likewise aggravating and threatening of violence.
See also:
Very mild types of anger are typically described as "distaste," "displeasure", or "irritation," while "rage" refers to an extreme degree of anger associated with a loss of calmness or discipline (in the case of human conduct)..
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