identical proposition

21 LETTERS · STARTS WITH I

identical proposition is a valid 21-letter word worth 27 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1D2E1N1T1I1C3A1L1P3R1O1P3O1S1I1T1I1O1N1

1 + 2 + 1 + 1 + 1 + 1 + 3 + 1 + 1 + 0 + 3 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =27 PTS

DOUBLE WORD → 54TRIPLE WORD → 81

MEANING

What does identical proposition mean?