rapidness

NOUN
9 LETTERS · STARTS WITH R

rapidness is a valid 9-letter word worth 12 points in Scrabble and 14 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1A1P3I1D2N1E1S1S1
1 + 1 + 3 + 1 + 2 + 1 + 1 + 1 + 1 =12 PTS
DOUBLE WORD → 24TRIPLE WORD → 36
MEANING

What does rapidness mean?