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English definition of “adieu”

adieu

exclamation uk   /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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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