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Definition of ruler noun from the Oxford Advanced American Dictionary

      

    ruler

     noun
    noun
    NAmE//ˈrulər//
     
     
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  1. 1a person who rules or governs
  2. 2a straight strip of wood, plastic, or metal, marked in inches or centimeters, used for measuring or for drawing straight lines
See the Oxford Advanced Learner's Dictionary entry: ruler

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