1. (noun) first class
the highest rank in a classification
Synonyms: first-class mail, first class Antonyms: inferior
2. (noun) first class, 1st class, first-class mail, 1st-class mail
mail that includes letters and postcards and packages sealed against inspection
Synonyms: first-class mail, first class Antonyms: inferior
3. (adj) first class
the most expensive accommodations on a ship or train or plane
Synonyms: first-class mail, first class Antonyms: inferior
4. (adverb) excellent, first-class, fantabulous, splendid
very good;of the highest quality
Synonyms: fantabulous, splendiferous, magnificent, excellent, resplendent, first-class, glorious, splendid, brilliant Antonyms: inferior
5. (adverb) first class
by first class conveyance; with first class accommodations
Synonyms: first class Antonyms: inferior
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