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English definition of “first-class”

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adjective /ˈfɜrstˈklæs/

first-class adjective (QUALITY)

of the highest quality or standard: a first-class education

first-class adjective (MAIL)

of or having to do with the standard way of mailing letters and cards: The price of a first-class stamp has gone up again.
(Definition of first-class adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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