1. [ noun ] the highest rank in a classification
Related terms: superiority
2. [ noun ] mail that includes letters and postcards and packages sealed against inspection
Synonyms: first-class_mail 1st-class_mail priority_mail 1st_class
Related terms: mail correspondence
3. [ noun ] (housing) the most expensive accommodations on a ship or train or plane
Related terms: accommodation
Similar spelling:   first-class