proper value

12 LETTERS · STARTS WITH P

proper value is a valid 12-letter word worth 18 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1O1P3E1R1V4A1L1U1E1

3 + 1 + 1 + 3 + 1 + 1 + 0 + 4 + 1 + 1 + 1 + 1 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does proper value mean?