Definition of layer noun from the Oxford Advanced American Dictionary

        

    layer

     noun
    noun
    NAmE//ˈleɪər//
     
     
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  1. 1a quantity or thickness of something that lies over a surface or between surfaces A thin layer of dust covered everything. How many layers of clothing are you wearing?
  2. 2a level or part within a system or set of ideas There were too many layers of management in the company. the layers of meaning in the poem
See the Oxford Advanced Learner's Dictionary entry: layer

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