first class

,first `class1 noun uncount *

1. ) the best and most expensive seats on an airplane or train, or the best and most expensive ACCOMMODATION (=place to sleep) on a ship:

He's sitting in first class.

2. ) the class of mail that is used for sending letters

first class

,first `class 2 or ,first-`class adjective *

1. ) relating to the best and most expensive seats on an airplane or a train, or the best and most expensive ACCOMMODATION on a ship:

a first-class ticket

The price includes first-class rail travel to Paris.

2. ) relating to the class of mail that is used for sending letters

3. ) of the best quality or the highest standard:

a first-class hotel

first-class service

first class

,first `class 3 adverb

using the most expensive form of transport or mail:

She always travels first class.