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altruistic

[al-troo-is-tik] /ˌæl truˈɪs tɪk/
adjective
1.
unselfishly concerned for or devoted to the welfare of others (opposed to egoistic).
2.
Animal Behavior. of or pertaining to behavior by an animal that may be to its disadvantage but that benefits others of its kind, often its close relatives.
Origin
1850-1855
1850-55; altru(ism) + -istic
Related forms
altruistically, adverb
hyperaltruistic, adjective
nonaltruistic, adjective
nonaltruistically, adverb
Synonyms
1. charitable, generous, philanthropic; benevolent, unselfish.
Antonyms
1. self-centered, selfish, mean.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for hyperaltruistic
altruistic
1853, from Fr. altruiste (adj.), from altruisme (see altruism).
Online Etymology Dictionary, © 2010 Douglas Harper
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