preference primary

18 LETTERS · STARTS WITH P

preference primary is a valid 18-letter word worth 31 points in Scrabble and 35 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1E1F4E1R1E1N1C3E1P3R1I1M3A1R1Y4

3 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 3 + 1 + 0 + 3 + 1 + 1 + 3 + 1 + 1 + 4 =31 PTS

DOUBLE WORD → 62TRIPLE WORD → 93

MEANING

What does preference primary mean?