noun Date: 1750 the first or highest group in a classification: as, the highest of usually three classes of travel accommodations, a class of mail that comprises letters, postcards, or matter sealed against inspection
FIRST CLASS
Meaning of FIRST CLASS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012