- 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
SynonymsSee more synonyms on Thesaurus.com
1. charitable, generous, philanthropic; benevolent, unselfish.
1. self-centered, selfish, mean.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Word Origin and History for non-altruistic
Online Etymology Dictionary, © 2010 Douglas Harper