Definition of adieu exclamation from the Oxford Advanced Learner's Dictionary

 

adieu

 exclamation
exclamation
BrE BrE//əˈdjuː//
 
; NAmE NAmE//əˈduː//
 
(from French)(old use or literary)
 
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goodbye I bid you adieu. Word Origin late Middle English: from Old French, from a ‘to’ + Dieu ‘God’
See the Oxford Advanced American Dictionary entry: adieu