Adjective first class has 1 sense
  1. excellent, first-class, fantabulous - of the highest quality; "made an excellent speech"; "the school has excellent teachers"; "a first-class mind"
    Antonym: inferior (indirect, via superior)
,Adverbial first class has 1 sense
  1. first-class - by first-class conveyance; with first-class accommodations; "we always travel first class"
,Noun first class has 3 senses
  1. first class - the highest rank in a classification
    --1 is a kind of
    superiority, high quality
  2. first class, 1st class, first-class mail, 1st-class mail, priority mail - mail that includes letters and postcards and packages sealed against inspection
    --2 is a kind of mail
    --2 has particulars: correspondence
  3. first class - the most expensive accommodations on a ship or train or plane
    --3 is a kind of
    accommodation
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