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

Farewell; a formula used to another person or persons when the speaker or writer or person addressed is departing.

Wiktionary
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
Antonyms:

Other Word Forms of Goodbye

Noun

Singular:
goodbye
Plural:
goodbyes

Origin 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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