| 释义 | fourth-classfourth-classadj  (Philately) of or relating to mail that is carried at the lowest rate   adv  (Philately) by fourth-class mailfourth′ class′n.   (in the U.S. Postal Service) the class of mail consisting of merchandise weighing one pound or more and not sealed against inspection.  [1860–65, Amer.]
 fourth′-class′
 adj.    1.  of, pertaining to, or designated as a class next below third.  adv.    2.  by fourth-class mail.  [1860–65]
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