The act of responding to an injury or wrong with a counterattack or revenge. A deliberate harmful action taken in response to perceived wrongdoing.
From Latin retaliatio, from retaliare meaning 'to repay in kind,' composed of re- (back) and talis (such). The concept of 'eye for an eye' justice has ancient roots in legal codes like Hammurabi's.
Retaliation follows a psychological principle called the 'tit-for-tat' strategy, which game theory shows can be surprisingly effective in maintaining cooperation. However, humans tend to escalate retaliation - we typically punish harder than we were hurt, leading to cycles of revenge.
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