"Buon Giorno" is the proper way to greet someone in the morning. Usually used until the late morning hours and not after Noon
Have a Good Day
"Buona Giornata" is what Italians say when they wish each other a good day
"Buona Sera" is the way to say good evening. Even at very late hours the greeting remains "buona sera"
"Buona Notte" is exclusively used at night and always as a "leaving" greeting and never as an introduction
"Arrivederci," is the widely popular and internationally recognized Italian word used to say goodbye and "see you later." It can be used at any time of day and without particular regards to seniority, therefore it can be used when speaking to anyone
"Ciao" is probably the most popular word in the Italian language and definitely the most famous across the world. If using "ciao" as "hello", do so only when greeting friends or those you are familiar with. Indeed, Italians have two levels of speaking, just like in Spanish or French, where the verbs and greetings are different according to the ranking and age of the person you are speaking to
"Salve" is not used very often and is never spoken when people take leave of one another. Equally used throughout the day and without concern for seniority it is considered a "rough" greeting and better to be avoided in favor of some other expression
"Ciao" can also mean "goodbye" and like its other version is used only among friends, although it has been taken by other languages, including English as a fancy way to say "goodbye." In Italy saying "ciao" to someone older or not familiar to you is actually considered impolite.
"Addio" is not used at all, but it translates into a very definite expression, when people are sure that they will never see each other again. It usually means that these people also shared something important; it could be for example two privates coming back home after a war or two spouses getting a divorce
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