first class

/ˈfɜrst klæs/
adjective
  1. Of the highest quality or standard; excellent.
    • We bought first-class tickets for the flight, so we had more legroom and better meals.
    • The hotel offered first-class service with a personal butler and gourmet meals.
    • She gave a first-class performance that earned her a standing ovation.
  2. Relating to the most expensive and comfortable class of travel on a plane, train, or ship.
    • First-class passengers can use the private lounge before boarding.
    • He upgraded his seat to first-class for the long overseas flight.
    • The train's first-class car had leather seats and complimentary drinks.
  3. Relating to the fastest and most expensive category of mail delivery.
    • Send the invitation by first-class mail so it arrives tomorrow.
    • I always use first-class stamps for important documents.
    • First-class postage costs more but ensures quicker delivery.
adverb
  1. Using the highest quality or most expensive class of service, especially in travel or mail.
    • She always travels first-class when her company pays for the trip.
    • They flew first-class to London for their anniversary.
    • If you mail the package first-class, it will get there in two days.