lexical insertion

17 LETTERS · STARTS WITH L

lexical insertion is a valid 17-letter word worth 25 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

L1E1X8I1C3A1L1I1N1S1E1R1T1I1O1N1

1 + 1 + 8 + 1 + 3 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =25 PTS

DOUBLE WORD → 50TRIPLE WORD → 75

MEANING

What does lexical insertion mean?