Answer: CIAO

AnswerCrossword Clue
CIAOGood-bye, in Rome
CIAOArty farewell
CIAOBologna greeting
CIAOGenoan greeting
CIAOContinental farewell
CIAO"Later," to Luigi
CIAOFirenze farewell
CIAO"Ta ta!"
CIAOSo long, in Salerno
CIAO"Later"
CIAO"So long!"
CIAO"A domani!"
CIAOItalian hello
CIAOParting word
CIAORoman hello
CIAORoman greeting
CIAOTrendy parting
CIAO"See ya!"
CIAOItalian's "So long"
CIAO"Bye!"
ciao(used as a word of greeting or parting): hello; goodbye; so long; see you later
CIAOAloha, in Roma
CIAOBologna bye
CIAOGenoa good-bye
CIAOVenice farewell!
CIAO"Later, alligator"
CIAOArrivederci
CIAOSlangy good-bye
CIAO"Later," to the jet set
CIAOBerlusconi's farewell
CIAO"TTYL"
CIAO"Later!"
CIAOFlorentine farewell
CIAO"Buon giorno!"
CIAO"Arrivederci"
CIAOFarewell
CIAOSee you in Rome?
CIAO"See ya"
CIAO""Arrivederci!""
CIAO"'Arrivederci'"