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first-class

 
 
/ˌfɜːstˈklɑːs/ adjective

Definition

BEST relating to the best and most expensive available service, especially when travelling or sending something somewhere: a first-class ticket a first-class stamp
VERY GOOD of very good quality: It was a first-class restaurant.
first class adverb How much is it to send this letter first class?
(Definition of first-class adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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