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fourth-class mail


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Also see: fourth-class | mail

WordReference Random House Learner's Dictionary of American English © 2026
ˈfourth ˈclass, n. [uncountable]
  1. Stampsa class of mail consisting of merchandise weighing one pound or more and not sealed against inspection.
fourth--class, adj., adv. 

WordReference Random House Unabridged Dictionary of American English © 2026
fourth class, 
  1. Stamps(in the U.S. Postal Service) the class of mail consisting of merchandise weighing one pound or more, including parcel post and all first-, second-, or third-class matter weighing 8 oz. (227 g) or more and not sealed against inspection.
  • 1860–65, American.

fourth-class  (fôrthklas, -kläs, fōrth-),USA pronunciation adj. 
  1. of, pertaining to, or designated as a class next below third, as for mailing, shipping, etc.

adv. 
  1. Stampsas fourth-class matter;
    by fourth-class mail:Send it fourth-class.

'fourth-class mail' also found in these entries (note: many are not synonyms or translations):

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