I. ˌfirst ˈclass BrE AmE noun
1 . [uncountable] the best and most expensive seats on a plane or train, or rooms in a hotel:
We prefer to travel in first class.
⇨ ↑ business class , ↑ cabin class , ↑ economy class , ↑ tourist class
2 . [uncountable]
a) the class of post used in Britain for letters and parcels, that is quicker and more expensive than second-class post ⇨ second class
b) the class of post used in the US for ordinary business and personal letters
3 . [countable] the highest class of degree from a British university
II. [m2]See main entry: ↑ first-class