upon which

10 LETTERS · STARTS WITH U

upon which is a valid 10-letter word worth 22 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

U1P3O1N1W4H4I1C3H4

1 + 3 + 1 + 1 + 0 + 4 + 4 + 1 + 3 + 4 =22 PTS

DOUBLE WORD → 44TRIPLE WORD → 66

MEANING

What does upon which mean?