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English definition of “adieu”

adieu

exclamation     /əˈdjuː/ /-ˈdjʊ/ US  /-ˈduː/ literary or old use
goodbye: She bade (= said to) him adieu and left.Foreign words and phrases used in EnglishWelcoming, greeting and greetings
(Definition of adieu exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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