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

first class

noun
 
/ˌfɜːst ˈklɑːs/
 
/ˌfɜːrst ˈklæs/
[uncountable]
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  1. the best and most expensive seats or accommodation on a train, plane or ship
    • There is more room in first class.
    Topics Transport by bus and trainb1, Transport by airb1
  2. (in the UK) the class of mail that is delivered most quickly
    • First class costs more.
  3. (in the US) the class of mail that is used for letters
  4. the highest standard of degree given by a British universityTopics Educationc2
See first class in the Oxford Advanced American Dictionary
previously
adverb
 
 
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B1
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