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English definition of “first class”

first class

adjective    
of excellent quality : The work that she did on the project was first class . He really is pre-eminent in the field and has built up a first-class business .
TRANSPORT relating to the highest level of service offered on a plane , train , etc.: a first-class cabin / fare / seat , etc.
in the UK, relating to the fastest service for sending mail : It is welcome news that first-class delivery has improved . The cost of a first-class stamp is going up.
in the US, relating to the service used for sending letters , cards , and small packages : He predicts first-class volume will decline by 20 percent by the year 2017 as fewer people sit down to write a letter . Experts expect that the U.S. Postal Service soon will request a price increase for first-class letters .
used to describe the best possible degree you can get from a university in the UK: A report showed that a first-class degree is worth , on average , 12% more in likely future earnings .
→ Compare business class noun, economy class, second-class adjective
(Definition of first class adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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