mechanical system

NOUN
17 LETTERS · STARTS WITH M

mechanical system is a valid 17-letter word worth 30 points in Scrabble and 34 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3E1C3H4A1N1I1C3A1L1S1Y4S1T1E1M3
3 + 1 + 3 + 4 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 3 =30 PTS
DOUBLE WORD → 60TRIPLE WORD → 90
MEANING

What does mechanical system mean?