interj. 25B6; noun & exclamation GOODBYE, farewell, until we meet again; informal bye-bye, ta-ta, bye, cheerio, cheers, ciao, so long; informal, dated toodle-oo, toodle-pip.
ADIEU
Meaning of ADIEU in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012