egalitarian
adjective
[ ɪˌɡalɪˈtɛːrɪən ]
• believing in or based on the principle that all people are equal and deserve equal rights and opportunities.
• "a fairer, more egalitarian society"
egalitarian
noun
• a person who advocates or supports the principle of equality for all people.
• "he was a social and political egalitarian"
Origin:
late 19th century: from French égalitaire, from égal ‘equal’, from Latin aequalis (see equal).