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[fawrth-klas, -klahs, fohrth-] /ˈfɔrθˈklæs, -ˈklɑs, ˈfoʊrθ-/

of, relating to, or designated as a class next below third, as for mailing, shipping, etc.
as fourth-class matter; by fourth-class mail:
Send it fourth-class.
(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 ounces (227 grams) or more and not sealed against inspection.
of or relating to mail that is carried at the lowest rate
by fourth-class mail


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