Etymology
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first-class (adj.)

"of the highest class" with reference to some standard of excellence, 1837, from first (adj.) + class (n.). Specifically in reference to conveyances for travel, 1846. In reference to U.S. Mail, 1875.

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Definitions of first-class

first-class (adj.)
very good; of the highest quality;
a first-class mind
From wordnet.princeton.edu