Definitions for fourth class
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Random House Webster's College Dictionary
fourth′ 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.
Category: Philately
Origin of fourth class:
1860–65, Amer.
fourth′-class′(adj.)
of, pertaining to, or designated as a class next below third.
(adv.)by fourth-class mail.
Category: Philately
Origin of fourth-class:
1860–65
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