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We found 18 dictionaries with English definitions that include the word up in the air:
Click on the first link on a line below to go directly to a page where "up in the air" is defined.

General (15 matching dictionaries)

1. up in_the_air: Merriam-Webster.com [home, info]
2. up in_the_air: Oxford Dictionaries [home, info]
3. up in_the_air: Collins English Dictionary [home, info]
4. up in_the_air: Vocabulary.com [home, info]
5. up in_the_air: Cambridge Advanced Learner's Dictionary [home, info]
6. up in_the_air: Wiktionary [home, info]
7. up in_the_air: Dictionary.com [home, info]
8. up in_the_air: UltraLingua English Dictionary [home, info]
9. Up in_the_Air (novel), Up in_the_Air (song), Up in_the_Air (soundtrack), Up in the Air, Up in the air: Wikipedia, the Free Encyclopedia [home, info]
10. up in_the_air: Rhymezone [home, info]
11. up in_the_air: Free Dictionary [home, info]
12. up in_the_air: Mnemonic Dictionary [home, info]
13. up in_the_air: WordNet 1.7 Vocabulary Helper [home, info]
14. up in_the_air: LookWAYup Translating Dictionary/Thesaurus [home, info]
15. up in_the_air: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

16. up in_the_air: Legal dictionary [home, info]

Miscellaneous (1 matching dictionary)

17. up in_the_air: Idioms [home, info]

Slang (1 matching dictionary)

18. Up in the air: Urban Dictionary [home, info]

Quick definitions from WordNet (up in the air) ▸ adjective:  very uncertain ("Left everything up in the air") ▸ adjective:  not yet determined ("Plans are still up in the air") ▸ Words similar to up in the air ▸ Usage examples for up in the air ▸ Popular nouns described by up in the air ▸ Words that often appear near up in the air ▸ Rhymes of up in the air ▸ Invented words related to up in the air