unselfishly concerned for or devoted to the welfare of others (opposed to egoistic).
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.
Origin of altruistic
Synonyms for altruistic
Antonyms for altruistic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Online Etymology Dictionary, © 2010 Douglas Harper