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English definition of “goodbye”

goodbye

exclamation, noun [C/U]    /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 great dinner. [U] Don’t go without saying goodbye to me, will you?
(Definition of goodbye exclamation, noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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