meliorist

NOUN
9 LETTERS · 3 SYLLABLES · STARTS WITH M

meliorist is a valid 9-letter word worth 11 points in Scrabble and 13 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3E1L1I1O1R1I1S1T1
3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does meliorist mean?