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English definition of “second class”

second class

adjective (LESS EXPENSIVE) (also second-class)    
relating to the less expensive way of travelling in a train , aircraft , etc., that most people use: a second-class carriage / ticket UK Second-class post is less expensive and sent less quickly than first-class : second-class mail / postage How much is a second-class stamp ?
(Definition of second class adjective (LESS EXPENSIVE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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