adieu
/əˈdjuː/
/əˈdju/
noun
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A farewell, a goodbye; especially a fond farewell, or a lasting or permanent farewell.
"We bid our final adieus to our family, then boarded the ship, bound for America."
interjection
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Said to wish a final farewell; goodbye.
Synonyms:
addio, adios, aloha, arrivederci, au revoir, auf Wiedersehen, bye, bye-bye, cheerio, cheers, ciao, farewell, good day, good-by, good-bye, goodbye, sayonara, shalom, so long