first class noun - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “first class”

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first class

noun [U]  /ˈfɜrst ˈklæs/
the best group or class, esp. the most expensive seats on a plane or a train: I upgraded my plane ticket to first class from tourist class.
(Definition of first class noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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