infinitive marker

17 LETTERS · STARTS WITH I

infinitive marker is a valid 17-letter word worth 28 points in Scrabble and 32 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1F4I1N1I1T1I1V4E1M3A1R1K5E1R1

1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 4 + 1 + 0 + 3 + 1 + 1 + 5 + 1 + 1 =28 PTS

DOUBLE WORD → 56TRIPLE WORD → 84

MEANING

What does infinitive marker mean?