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

     

    first class

     noun
    noun
    BrE BrE//ˌfɜːst ˈklɑːs//
     
    ; NAmE NAmE//ˌfɜːrst ˈklæs//
     
    [uncountable] Exams and degrees, Trains, Plane travel, Parts of boats and ships
     
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  1. 1the best and most expensive seats or accommodation on a train, plane or ship There is more room in first class. See related entries: Trains, Plane travel, Parts of boats and ships
  2. 2(in Britain) the class of mail that is delivered most quickly First class costs more.
  3. 3(in the US) the class of mail that is used for letters
  4. 4the highest standard of degree given by a British university See related entries: Exams and degrees
See the Oxford Advanced American Dictionary entry: first class