difference equation

19 LETTERS · STARTS WITH D

difference equation is a valid 19-letter word worth 36 points in Scrabble and 40 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

D2I1F4F4E1R1E1N1C3E1E1Q10U1A1T1I1O1N1

2 + 1 + 4 + 4 + 1 + 1 + 1 + 1 + 3 + 1 + 0 + 1 + 10 + 1 + 1 + 1 + 1 + 1 + 1 =36 PTS

DOUBLE WORD → 72TRIPLE WORD → 108

MEANING

What does difference equation mean?