Definition of first-class adjective from the Oxford Advanced American Dictionary

     

    first-class

     adjective
    adjective
     
     
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  1. 1[usually before noun] in the best group; of the highest standard synonym excellent a first-class novel a first-class writer The car was in first-class condition. I know a place where the food is first-class.
  2. 2 [only before noun] connected with the best and most expensive way of traveling on a plane, train, or ship first-class plane travel a first-class cabin/seat/ticket
  3. 3 [only before noun] connected with mail that costs the most to send first-class mail/postage/stamps
See the Oxford Advanced Learner's Dictionary entry: first-class