A child purposefully, but harmlessly, striking his father repeatedly in a temper tantrum would not count as aggression according to the social psychology definition.

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Aggression in social psychology is defined as any form of behavior directed toward the goal of harming or injuring another living being who is motivated to avoid such treatment. The intent behind the action (purposefully striking) qualifies it as aggression, regardless of the harm level.

A Child Purposefully, but Harmlessly, Striking His Father Repeatedly in a Temper