: a person who works to make other people's lives better
She has been recognized as a great humanitarian for her efforts to end world hunger.
— humanitarian adjective, always used before a noun
humanitarian aid [=help or money given to people, countries, etc., in order to improve living conditions]
— humanitarianism /hjuˌmænəˈterijəˌnɪzəm/ noun [noncount]
She has been honored for her humanitarianism.