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We found 25 dictionaries with English definitions that include the word so long:
Click on the first link on a line below to go directly to a page where "so long" is defined.

General (22 matching dictionaries)

1. so long: Merriam-Webster.com [home, info]
2. so long: Oxford Learner's Dictionaries [home, info]
3. so long: American Heritage Dictionary of the English Language [home, info]
4. so long: Collins English Dictionary [home, info]
5. so long: Vocabulary.com [home, info]
6. So-long, so-long: Wordnik [home, info]
7. so long: Cambridge Advanced Learner's Dictionary [home, info]
8. so long: Wiktionary [home, info]
9. so long: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. so long: Infoplease Dictionary [home, info]
11. so long, so long: Dictionary.com [home, info]
12. so long: Online Etymology Dictionary [home, info]
13. So Long (ABBA song), So Long (Diplo song), So Long (Russ Morgan song), So Long (song): Wikipedia, the Free Encyclopedia [home, info]
14. so long: Rhymezone [home, info]
15. so long: Free Dictionary [home, info]
16. so long: Mnemonic Dictionary [home, info]
17. so long: WordNet 1.7 Vocabulary Helper [home, info]
18. so long: LookWAYup Translating Dictionary/Thesaurus [home, info]
19. so long: Dictionary/thesaurus [home, info]
20. so-long: Wikimedia Commons US English Pronunciations [home, info]

Computing (1 matching dictionary)

21. so long: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

22. so long: Idioms [home, info]

Slang (1 matching dictionary)

23. so long: Urban Dictionary [home, info]

(Note: See so_longs for more definitions.)

Quick definitions from WordNet (so long) ▸ noun:  a farewell remark ▸ Also see so_longs ▸ Word origin ▸ Words similar to so long ▸ Usage examples for so long ▸ Idioms related to so long (New!) ▸ Words that often appear near so long ▸ Rhymes of so long ▸ Invented words related to so long