Definition of third class noun from the Oxford Advanced Learner's Dictionary

  1. 1[uncountable, singular] (especially in the past) the cheapest and least comfortable part of a train, ship, etc. See related entries: Trains, Train and bus travel
  2. 2[uncountable] (in the US) the class of mail used for sending advertisements, etc.
  3. 3[uncountable, singular] the lowest standard of degree given by a British university See related entries: Exams and degrees
See the Oxford Advanced American Dictionary entry: third class

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