EnglishMain Dictionary
third-class
Universal Words
adjective
1 (especially in the past) connected with the cheapest and least comfortable way of travelling on a train, ship, etc.
2 (in the US) connected with the class of mail used to send advertisements, etc.
3 [onlybeforenoun] used to describe the lowest standard of degree given by a British university
4 (disapproving) (of people) less important than other people:
They are treated as third-class citizens.
third-class adverb:
to travel third-class