subsidiary sense

16 LETTERS · STARTS WITH S

subsidiary sense is a valid 16-letter word worth 21 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1U1B3S1I1D2I1A1R1Y4S1E1N1S1E1

1 + 1 + 3 + 1 + 1 + 2 + 1 + 1 + 1 + 4 + 0 + 1 + 1 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does subsidiary sense mean?