derivative action

17 LETTERS · STARTS WITH D

derivative action is a valid 17-letter word worth 25 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

D2E1R1I1V4A1T1I1V4E1A1C3T1I1O1N1

2 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 4 + 1 + 0 + 1 + 3 + 1 + 1 + 1 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does derivative action mean?