Longman Dictionary of Contemporary English homepage

altruistic

 adjective
     
al‧tru‧is‧tic
altruistic behaviour shows that you care about and will help other people, even though this brings no advantage for yourself [≠ selfish]:
Were his motives entirely altruistic?
—altruistically adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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