partial differential

20 LETTERS · STARTS WITH P

partial differential is a valid 20-letter word worth 28 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3A1R1T1I1A1L1D2I1F4F4E1R1E1N1T1I1A1L1

3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 4 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =28 PTS

DOUBLE WORD → 56TRIPLE WORD → 84

MEANING

What does partial differential mean?