al ‧ tru ‧ is ‧ m /ˈæltru-ɪz ə m/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: French ; Origin: altruisme , from autrui 'other people' ]
when you care about or help other people, even though this brings no advantage to yourself:
Many choose to work in developing countries out of altruism.
—altruist noun [countable]