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English definition of “first class”

first class

adverb    
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 use the most expensive and fastest type of post : How much more would it cost to send it first class ?
(Definition of first class adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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