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

     

    first-class

     adjective
    adjective
    BrE
     
    ; NAmE
     
     
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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 travelling on a train, plane or ship first-class rail travel a first-class cabin/seat/ticket
  3. 3[only before noun] (in Britain) connected with letters, packages, etc. that are delivered most quickly, or that cost more to send first-class mail/post/postage/stamps
  4. 4[only before noun] used to describe a university degree of the highest class from a British university She was awarded a first-class degree in English.
See the Oxford Advanced American Dictionary entry: first-class