inertial system

15 LETTERS · STARTS WITH I

inertial system is a valid 15-letter word worth 19 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1E1R1T1I1A1L1S1Y4S1T1E1M3

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 3 =19 PTS

DOUBLE WORD → 38TRIPLE WORD → 57

MEANING

What does inertial system mean?