dissimulation

NOUN /dɪ,sɪmjə'leɪʃən/
13 LETTERS · 5 SYLLABLES · STARTS WITH D

dissimulation is a valid 13-letter word worth 16 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2I1S1S1I1M3U1L1A1T1I1O1N1
2 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =16 PTS
DOUBLE WORD → 32TRIPLE WORD → 48
MEANING

What does dissimulation mean?