circular argument

17 LETTERS · STARTS WITH C

circular argument is a valid 17-letter word worth 23 points in Scrabble and 31 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

C3I1R1C3U1L1A1R1A1R1G2U1M3E1N1T1

3 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 2 + 1 + 3 + 1 + 1 + 1 =23 PTS

DOUBLE WORD → 46TRIPLE WORD → 69

MEANING

What does circular argument mean?