Dictionary
first class
noun
: the best of usually three kinds of service you can have when you travel
: a class of mail in the U.S. that includes letters and postcards
: 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
Full Definition of FIRST CLASS
: the first or highest group in a classification: as a : the highest of usually three classes of travel accommodations b : a class of mail that comprises letters, postcards, or matter sealed against inspection
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First Known Use of FIRST CLASS
1750
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