American English

Definition of rarefied adjective from the Oxford Advanced American Dictionary



    [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 Learner's Dictionary entry: rarefied