American English

Definition of first class adverb from the Oxford Advanced American Dictionary

     

    first class

     adverb
    adverb
     
     
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  1. 1 using the best and most expensive seats or rooms in a plane, train, or ship to travel first class
  2. 2 by the class of mail that is used for letters I sent the package first class on Monday.
See the Oxford Advanced Learner's Dictionary entry: first class