Intentional behaviour that benefits another at a cost to oneself is termed:

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Altruism involves intentionally behaving in a way that benefits others, even if it comes at a cost to oneself. This differs from other concepts listed such as companionate love or cooperation, as it specifically refers to acts of selflessness. Reciprocal altruism also involves benefiting others, but it is based on the expectation that the favor will be returned at some point in the future, whereas true altruism does not involve a direct expectation of reciprocation.

Intentional Behaviour That Benefits Another at a Cost to Oneself