ameliorate

VERB /ə'miljə,reɪt/
10 LETTERS · 4 SYLLABLES · STARTS WITH A

ameliorate is a valid 10-letter word worth 12 points in Scrabble and 14 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1M3E1L1I1O1R1A1T1E1
1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =12 PTS
DOUBLE WORD → 24TRIPLE WORD → 36
MEANING

What does ameliorate mean?