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English definition of “first class”

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first class

adjective uk ( also first-class)   us  

first class adjective (EXCELLENT)

excellent: She did a first-class job of decorating the living room.

first class adjective (QUALIFICATION)

used to refer to the best possible undergraduate university degree you can get in the UK and some other countries

first class adjective (MOST EXPENSIVE)

relating to the most expensive and highest quality service on a plane or train, or in a hotel: a first-class ticket first-class accommodation/travel relating to the service for sending post that people usually use: first-class mail/postage How much is a first-class stamp?
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first class

adverb uk   us  
If you travel first class in a train, aircraft, etc., you use the best and most expensive type of service: She always travels first class. UK If you send something first class, you send it by the usual post service: How much more would it cost to send it first class?

first class

noun [U] uk   us  
the best and most expensive seats on a plane or in a train: Because of the delay, we were offered seats in first class. UK the post service that most people use for sending letters, etc.: First class costs more, but it will arrive tomorrow.
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(Definition of first class from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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