mediator

NOUN /midi,eɪtər/
8 LETTERS · 4 SYLLABLES · STARTS WITH M

mediator is a valid 8-letter word worth 11 points in Scrabble and 12 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3E1D2I1A1T1O1R1
3 + 1 + 2 + 1 + 1 + 1 + 1 + 1 =11 PTS
DOUBLE WORD → 22TRIPLE WORD → 33
MEANING

What does mediator mean?