ˌthird ˈclass BrE AmE noun [uncountable]
1 . a cheap class of mail in the US, usually used for sending advertisements
2 . the lowest type of degree that is given by a British university
3 . old-fashioned the cheapest and least comfortable part of a train or ship
—third-class adjective , adverb :
We travelled third-class.
⇨ ↑ first class , ↑ second class