The Collaborative International Dictionary of English v.0.48:
Equalitarian \E*qual`i*ta"ri*an\, n. One who believes in equalizing the condition of men; a leveler. [1913 Webster]WordNet (r) 3.0 (2006):
equalitarian n 1: a person who believes in the equality of all people [syn: egalitarian, equalitarian] [ant: elitist]