arrivederci

NOUN /,ɑRRivɛ'dɛRʧi/
11 LETTERS · 5 SYLLABLES · STARTS WITH A

arrivederci is a valid 11-letter word worth 17 points in Scrabble and 19 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1R1R1I1V4E1D2E1R1C3I1
1 + 1 + 1 + 1 + 4 + 1 + 2 + 1 + 1 + 3 + 1 =17 PTS
DOUBLE WORD → 34TRIPLE WORD → 51
MEANING

What does arrivederci mean?