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

rarefied

adjective
 
/ˈreərɪfaɪd/
 
/ˈrerɪfaɪd/
[usually before noun]
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  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. (of air) containing less oxygen than usual
    • Climbers may experience difficulty breathing in the rarefied air at high altitudes.
See rarefied in the Oxford Advanced American Dictionary
hide-and-seek
noun
 
 
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