American English

Definition of third class noun from the Oxford Advanced American Dictionary

     

    third class

     noun
    noun
     
     
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  1. 1 [uncountable] the class of mail used for sending advertisements, etc.
  2. 2[uncountable, singular] (especially in the past) the cheapest and least comfortable part of a train, ship, etc.
See the Oxford Advanced Learner's Dictionary entry: third class

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