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first class

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first classnoun
first class
noun
Learner's definition of FIRST CLASS  
[noncount]
: the best or highest group or class: such as
: the best of usually three kinds of service you can have when you travel
   b  : a class of mail in the U.S. that includes letters and postcards
   c  : a class of mail in the U.K. that includes letters and packages which are delivered sooner than ordinary second-class mail but cost more to send
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