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A way to bid farewell, similar to 'goodbye' or 'see you later'
Arrivederci, signore!
Goodbye, sir!
More formal than 'ciao', often used in formal situations or when parting ways for an extended period
Use 'arrivederci' in formal situations or when you want to express a more permanent goodbye
From 'arrivare' (to arrive) and 'dietro' or 'ci' (behind, or to us), implying 'until we meet again'
Generally used when you expect to see the person again, or in more formal situations