Definition of rarefied adjective from the Oxford Advanced Learner's Dictionary

     

    rarefied

     adjective
    adjective
    BrE BrE//ˈreərɪfaɪd//
     
    ; NAmE NAmE//ˈrerəfaɪd//
     
    [usually before noun]
     
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  1. 1(often disapproving) understood or experienced by only a very small group of people who share a particular area of knowledge or activity the rarefied atmosphere of academic life
  2. 2(of air) containing less oxygen than usual Climbers may experience difficulty breathing in the rarefied air at high altitudes.
See the Oxford Advanced American Dictionary entry: rarefied