altruist

[al-troo-ist]
noun
a person unselfishly concerned for or devoted to the welfare of others (opposed to egoist ).

Origin:
1865–70; < French altruiste; see altruism, -ist

hyperaltruist, noun
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World English Dictionary
altruism (ˈæltruːˌɪzəm)
 
n
1.  the principle or practice of unselfish concern for the welfare of others
2.  the philosophical doctrine that right action is that which produces the greatest benefit to others
 
[C19: from French altruisme, from Italian altrui others, from Latin alterī, plural of alter other]
 
'altruist
 
n
 
altru'istic
 
adj
 
altru'istically
 
adv

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Example sentences
The altruist group of decision makers weighted economic, social, and environmental costs nearly equally.
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