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

     

    first class

     adverb
    adverb
    BrE BrE//ˌfɜːst ˈklɑːs//
     
    ; NAmE NAmE//ˌfɜːrst ˈklæs//
     
    Train and bus travel, Parts of boats and ships
     
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  1. 1using the best and most expensive seats or accommodation in a train, plane or ship to travel first class See related entries: Train and bus travel, Parts of boats and ships
  2. 2(in Britain) by the quickest form of mail I sent the package first class on Monday.
  3. 3(in the US) by the class of mail that is used for letters
See the Oxford Advanced American Dictionary entry: first class