Definition of overlay noun from the Oxford Advanced Learner's Dictionary

     

    overlay

     noun
    noun
    BrE BrE//ˈəʊvəleɪ//
     
    ; NAmE NAmE//ˈoʊvərleɪ//
     
     
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  1. 1a transparent sheet with drawings, figures, etc. on it that can be placed on top of another sheet in order to change it An overlay showing population can be placed on top of the map.
  2. 2a thing that is laid on top of or covers something else an overlay of fibreglass insulation
See the Oxford Advanced American Dictionary entry: overlay

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