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Altruism
Positive Connotation
Altruism has a positive meaning and is associated with kindness, making it fitting for commendations. 
Humanitarian Context
Use 'altruism' when discussing voluntary work or charity, where there is no expectation of a reward. 
Not Self-Interest
Altruism is the opposite of self-interest; it's helping others, often with a cost to oneself. 