Main Entry: al·tru·ism
Pronunciation: 'al-tru-"i-z&m
Etymology: French altruisme, from autrui other people, from Old French, oblique case form of autre other, from Latin alter
1 : unselfish regard for or devotion to the welfare of others
2 : behavior by an animal that is not beneficial to or may be harmful to itself but that benefits others of its species

http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=altruism