meliorist adjective 2noun 1forms 3 adjective2 •Of or relating to meliorism. •Supporting the principles of meliorism. noun1 •A proponent of meliorism"Who knows but that such age-old customs, rooted in dark, immemorial country lore and probably of pagan origin, may not put shallow urban meliorists out of countenance?". — 2001 formsmeliorists · more meliorist · most meliorist