misestimation

NOUN
13 LETTERS · 5 SYLLABLES · STARTS WITH M

misestimation is a valid 13-letter word worth 17 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3I1S1E1S1T1I1M3A1T1I1O1N1
3 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does misestimation mean?