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Entry 1 sense Webster, 1913

first-class

/(fẽrst"klăs`)/ · first·-class · IPA /fˌɜrstklˈæs/
01 a. Of the best class; of the highest rank; in the first division; of the best quality; first-rate; as, a first-class telescope.
  1. 1.
    Of the best class; of the highest rank; in the first division; of the best quality; first-rate; as, a first-class telescope.
Phrases & compounds
First-class car — any passenger car of the highest regular class, and intended for passengers who pay the highest regular rate; -- distinguished from a second-class car.