Definition of blue-sky adjective from the Oxford Advanced American Dictionary

 

blue-sky

 adjective
adjective
 
[only before noun]
 
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involving new and interesting ideas which are not yet possible or practical The government has been doing some blue-sky thinking on how to improve school standards. The laboratory tries to maintain a balance between applied research and blue-sky research. A team of designers have been briefed to come up with blue-sky ideas to overhaul the company's image.
See the Oxford Advanced Learner's Dictionary entry: blue-sky

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