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English definition of “air”

air

noun [U]     /r/
by air TRANSPORT travelling by or using planes: arrive/travel by air 25% of the state's economy is fueled by tourists who travel by air.deliver/send/ship sth by air The company adds a surcharge for express packages delivered by air.
up in the air if a matter is up in the air, it is uncertain and no final decision has been made about it: The future of the company has been up in the air since one of its key shareholders was compelled to sell its stake.
(Definition of air noun from the Cambridge Business English Dictionary © Cambridge University Press)
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