Definition of third-class
(Entry 1 of 2)
: of or relating to a class, rank, or grade next below the second
third class
nounDefinition of third class (Entry 2 of 2)
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 U.S. mail comprising circulars, pamphlets, catalogs, and newsletters
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Merriam-Webster unabridged
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Time Traveler for third-class
The first known use of third-class was in 1748
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