Simple Definition of third class
: the level of service on a train, ship, etc., that is the cheapest
: a class of mail in the U.S. that includes advertisements
: an undergraduate degree of the lowest level given by a British university
Full Definition of third class
1 : the third and usually next below second class in a classification
2 : the least expensive class of accommodations (as on a passenger ship)
3 : a former class of United States mail comprising circulars, pamphlets, catalogs, and newsletters
Examples of third class
She got a third class in English.
First Known Use of third class
Seen and Heard
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