first-classˌfirst-ˈclass (also first class) adjectiveadj1if something is first-class, it is of very good quality and much better than other things of the same typeWe provide a first-class, professional service for our customers.
2using first-class maila first-class stamp
3TRAVELfirst class seats, accommodation etc are the most comfortable and expensive availablefirst-class airline tickets
The airline claims its 9,000 daily first-class seats are 65% full.
—first class adverbadvIf you send the letter first class, it should arrive tomorrow.
Company policy says we cannot fly first class, but we can fly business class on trips over a thousand miles.