additive process

16 LETTERS · STARTS WITH A

additive process is a valid 16-letter word worth 24 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

A1D2D2I1T1I1V4E1P3R1O1C3E1S1S1

1 + 2 + 2 + 1 + 1 + 1 + 4 + 1 + 0 + 3 + 1 + 1 + 3 + 1 + 1 + 1 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does additive process mean?