au revoir
UK /ˌəʊ.ɹə ˈvwɑː/ · US /ˌoʊ.ɹə ˈvwɑɹ/ interjection
Synonyms
adieu adios aloha arrivederci auf Wiedersehen badbye BCNU bye bye-bye catch you later ciao cheerio cheers cheery-bye chur farewell good day Godspeed hasta la vista baby good-by goodby good-bye goodbye sayonara so long
Etymology
Unadapted borrowing from French au revoir, with relatively formal but otherwise identical meaning, possibly due to the cumbersome nature of formal English equivalents.
Webster’s 1913
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “au revoir”, CC BY-SA 4.0. Details