ataraxia

NOUN /,ætə'ræksiə/
8 LETTERS · 5 SYLLABLES · STARTS WITH A

ataraxia is a valid 8-letter word worth 15 points in Scrabble and 15 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1T1A1R1A1X8I1A1
1 + 1 + 1 + 1 + 1 + 8 + 1 + 1 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does ataraxia mean?