master controller

17 LETTERS · STARTS WITH M

master controller is a valid 17-letter word worth 20 points in Scrabble and 25 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

M3A1S1T1E1R1C3O1N1T1R1O1L1L1E1R1

3 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does master controller mean?