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English definition of “second class”

second class

noun [U]    
the seats on a plane or in a train that are less good and less expensive than first class: Second class is at the rear of the train.Travelling UK a less expensive and slower type of post than first class: How much does it cost for second class?The postal system
(Definition of second class noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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