Definition of diner noun from the Oxford Advanced American Dictionary

     

    diner

     noun
    noun
    NAmE//ˈdaɪnər//
     
     
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  1. 1a person eating a meal, especially in a restaurant a restaurant capable of seating 100 diners
  2. 2 a small, usually cheap, restaurant a roadside diner
See the Oxford Advanced Learner's Dictionary entry: diner