Longman Dictionary of Contemporary English homepage

rarefied

 adjective
     
Related topics: Nature, Earth Sciences
rar‧e‧fied [usually before noun]
1 a rarefied place, organization, or type of activity is only available to or understood by a small group of people - used to show disapproval:
the rarefied atmosphere of academia
2DNHE rarefied air is the air in high places, which has less oxygen than usual
Definition from the Longman Dictionary of Contemporary English
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