first class meaning and definition

FIRST CLASS noun

Definition of first class (noun)

1. the highest rank in a classification
2. mail that includes letters and postcards and packages sealed against inspection
   • synonyms: 1st class, 1st-class mail, first-class mail
3. the most expensive accommodations on a ship or train or plane

FIRST CLASS adverb

Definition of first class (adverb)

1. by first class conveyance; with first class accommodations
   • "we always travel first class"