1. (noun)adieu, adios, arrivederci, auf wiedersehen, au revoir, bye, bye-bye, cheerio, good-by, goodby, good-bye, goodbye, good day, sayonara, so long a farewell remark Synonyms: au revoir, sayonara, pass, good-by, auf wiedersehen, arrivederci, adios, goodbye, good day, good-bye, goodby, adieu, so long, bye, bye-bye, cheerio
Synonyms and Antonyms of ADIOS 
