supremacy

NOUN /sə'prɛməsi/
9 LETTERS · 4 SYLLABLES · STARTS WITH S

supremacy is a valid 9-letter word worth 18 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1U1P3R1E1M3A1C3Y4
1 + 1 + 3 + 1 + 1 + 3 + 1 + 3 + 4 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does supremacy mean?