Definitions for up in the air
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Princeton's WordNet
up in the air(adj)
very uncertain
"left everything up in the air"
up in the air(adj)
not yet determined
"plans are still up in the air"
Wiktionary
up in the air(Adverb)
up in or into the sky or air.
up in the air(Adjective)
Not yet resolved, finished, answered, decided or certain.
Citation
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"up in the air." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/up in the air>.

