goodbye Definition in the Cambridge English Dictionary
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Definition of “goodbye” - English Dictionary

Definition of "goodbye" - American English Dictionary

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goodbyeexclamation, noun [C/U]

 us   /ɡʊdˈbɑɪ/ (short form bye,  /ˈbɑɪ/ , infml bye-bye,  /bɑɪˈbɑɪ/ )
said when you are going away from someone ​else, or the ​act of saying this when you are going away: [U] Goodbye, Roberto, and ​thanks again for a ​greatdinner. [U] Don’t go without saying goodbye to me, will you?
(Definition of goodbye from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "goodbye" - British English Dictionary

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goodbyeexclamation

uk   us   /ɡʊdˈbaɪ/ (informal bye)
A1 used when someone ​leaves: Goodbye Bill! ​See you next ​week.
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goodbyenoun [C]

uk   us   /ɡʊdˈbaɪ/
the words or ​actions that are used when someone ​leaves or is ​left: Don't go without saying goodbye to me, will you? She kissed her ​children goodbye before ​leaving for ​work. We saidour goodbyes, and ​left. I ​hatelongdrawn-out goodbyes (= ​acts of ​leaving).
(Definition of goodbye from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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