Definition of first-class
- a first-class meal
: of or relating to first class
: of the best quality : of the highest excellence
: 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
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