first class noun
[noncount] : the best or highest group or class: such as a : the best of usually three kinds of service you can have when you travel
▪ flying in first class
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
▪ flying in first class
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
