Topic: WATER
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third class [uncountable]
1TCM a cheap class of mail in the US, usually used for sending advertisements
2SEC the lowest type of degree that is given by a British university
3TTW 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
We travelled third-class.