Definition of quiet noun from the Oxford Advanced American Dictionary

 

quiet

 noun
noun
NAmE//ˈkwaɪət//
 
[uncountable]
 
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  • the state of being calm and without much noise the quiet of his own room the quiet of the early morning I go to the library for a little peace and quiet.
  • Idioms
    on the quiet
     
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    without telling anyone synonym secretly He'd been meeting her on the quiet.
    See the Oxford Advanced Learner's Dictionary entry: quiet