Function: noun
Date: 1748
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 : a class of U.S. 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 b : a similar class of Canadian mail with different weight limits