See also: third-class
- (US) A reduced-rate mail service for printed matter.
- (Britain, historical) The cheapest accommodation on a train or ship.
- 2012, Andrew Martin, Underground Overground: A passenger's history of the Tube, Profile Books, →ISBN, page 46:
- Mayhew's survey found that 69 per cent of Met travellers went by third class, 20.5 per cent second, 10.5 per cent first. The Met would abolish second class in 1905 at the time of electrification.
- third-class (adjective)