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English definition of “first class”

first class

noun [U]    
the best seats, service, etc. on a plane, train, etc.: I didn't see him on the flight because he was in first class.
in the UK, the fastest service for sending mail: Always use first class for sending these documents.
in the US, the service for sending letters, cards and small packages
(Definition of first class noun from the Cambridge Business English Dictionary © Cambridge University Press)
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