noun Date: 1748 the third and usually next below second class in a classification, the least expensive class of accommodations (as on a passenger ship), 3. a class of United States mail comprising printed matter exclusive of regularly issued periodicals and merchandise less than 16 ounces (454 grams) in weight that is not sealed against inspection, a similar class of Canadian mail with different weight limits
THIRD CLASS
Meaning of THIRD CLASS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012