Goodbye Definition
 gyo͝odbī 
  goodby, good-bye, goodbyes, good-byes, good-bys
  
    interjection
  
 Farewell.
 Webster's New World 
Used to express an acknowledgment of parting.
 American Heritage 
Synonyms: 
  - alligator; have a nice day
 - don't work too hard; see you later
 - take-it-easy
 - see-you-later
 - ciao (Italian)
 - be good
 - don't work too hard*
 - God bless you and keep you
 - farewell
 - a rivederci (Italian)
 - au revoir (French)
 - adios (Spanish)
 - God be with you
 - cheerio
 - bye-bye
 
    noun
  
 
    goodbyes
  
An acknowledgment at parting, especially by saying “goodbye.”
 American Heritage 
An act of parting or leave-taking.
 Many sad goodbyes.
 American Heritage 
An utterance of goodbye, the wishing of farewell to someone.
John gave Rebecca a goodbye to wish her luck on her holiday.
 Wiktionary 
Synonyms: 
 Antonyms: 
 Other Word Forms of Goodbye
Noun
Singular:
 goodbyePlural:
 goodbyesOrigin of Goodbye
-  
From earlier Godby, Godby'e, Godbwye, God b'w'y, God bwy yee, God buy you, God be wi' you: each a progressively shorter contraction of God be with you, with change of God to good by confusion with good morning, good day, etc.
From Wiktionary
 Alteration (influenced by good day) of God be with you
From American Heritage Dictionary of the English Language, 5th Edition
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