Definition of goodbye in English:

goodbye

Syllabification: good·bye
Pronunciation: /ɡo͝odˈbī
 
/
(also goodby or good-by)

exclamation

Used to express good wishes when parting or at the end of a conversation.
More example sentences
  • Papa remained stoic for the most part, but sounded rather choked when he wished me goodbye.
  • I'll go over for a few hours, have dinner with Mama and Papa, wish them goodbye and all that.
  • We go to say goodbye, and instead of a handshake I get not one kiss, but two.
Synonyms
farewell, adieu, au revoir, ciao, adios; bye, bye-bye, so long, see you later, see you, sayonara; bon voyage; cheers
informal toodle-oo

noun (plural goodbyes or goodbys)

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An instance of saying “goodbye”; a parting: a final goodbye
More example sentences
  • Saying what are likely to be final goodbyes is something else again.
  • With a sudden jerk the we move forward, a few tears are shed, hands wave final goodbyes in a mad frenzy.
  • The couple went to the airport where they said their final heartbreaking goodbyes to each other.
Synonyms

Origin

late 16th century: contraction of God be with you!, with good substituted on the pattern of phrases such as good morning.

Definition of goodbye in:

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adjective
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