integral function

17 LETTERS · STARTS WITH I

integral function is a valid 17-letter word worth 22 points in Scrabble and 29 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1T1E1G2R1A1L1F4U1N1C3T1I1O1N1

1 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 0 + 4 + 1 + 1 + 3 + 1 + 1 + 1 + 1 =22 PTS

DOUBLE WORD → 44TRIPLE WORD → 66

MEANING

What does integral function mean?