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English definition of “second class”

second class

adverb    
If you travel second class in a train, aircraft, etc., you use the less expensive type of ticket that most people use: We always travel second class.Travelling UK If you send something second class, you send it using the less expensive type of post: How much less would it cost to send it second class?The postal system
(Definition of second class adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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