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We found 23 dictionaries with English definitions that include the word bye-bye:
Click on the first link on a line below to go directly to a page where "bye-bye" is defined.

General (22 matching dictionaries)

1. bye-bye: Merriam-Webster.com [home, info]
2. bye-bye: Oxford Learner's Dictionaries [home, info]
3. bye-bye: American Heritage Dictionary of the English Language [home, info]
4. bye-bye, bye-bye: Collins English Dictionary [home, info]
5. bye-bye: Vocabulary.com [home, info]
6. bye-bye: Macmillan Dictionary [home, info]
7. Bye-Bye, Bye-bye, bye-bye, bye-Bye: Wordnik [home, info]
8. bye-bye: Cambridge Advanced Learner's Dictionary [home, info]
9. bye-bye: Wiktionary [home, info]
10. bye-bye: Webster's New World College Dictionary, 4th Ed. [home, info]
11. bye-bye: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. bye-bye: Infoplease Dictionary [home, info]
13. bye-bye: Dictionary.com [home, info]
14. bye-bye: Cambridge Dictionary of American English [home, info]
15. bye-bye: Rhymezone [home, info]
16. bye-bye: Free Dictionary [home, info]
17. bye-bye: Mnemonic Dictionary [home, info]
18. bye-bye: WordNet 1.7 Vocabulary Helper [home, info]
19. bye-bye: LookWAYup Translating Dictionary/Thesaurus [home, info]
20. bye-bye, bye-bye: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

21. bye-bye: Encyclopedia [home, info]

(Note: See bye-byes for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (bye-bye) ▸ noun:  a farewell remark ▸ Also see bye-byes ▸ Words similar to bye-bye ▸ Usage examples for bye-bye ▸ Idioms related to bye-bye (New!) ▸ Popular adjectives describing bye-bye ▸ Words that often appear near bye-bye ▸ Rhymes of bye-bye ▸ Invented words related to bye-bye