tractability

NOUN
12 LETTERS · STARTS WITH T

tractability is a valid 12-letter word worth 19 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1R1A1C3T1A1B3I1L1I1T1Y4
1 + 1 + 1 + 3 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 4 =19 PTS
DOUBLE WORD → 38TRIPLE WORD → 57
MEANING

What does tractability mean?