1. unselfishly concerned for or devoted to the welfare of others (opposed to egoistic).
2. Animal Behavior. of or relating to behavior by an animal that may be to its disadvantage but that benefits others of its kind, often its close relatives.
"people can be altruistic to relatives."
"people can be altruistic to others."
"people can be altruistic to herses."
"behaviours can be altruistic."
"motives can be altruistic."
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