fourth class

fourth class

noun
(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.

Origin:
1860–65, Americanism

Dictionary.com Unabridged

fourth-class

[fawrth-klas, -klahs, fohrth-]
adjective
1.
of, pertaining to, or designated as a class next below third, as for mailing, shipping, etc.
adverb
2.
as fourth-class matter; by fourth-class mail: Send it fourth-class.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
fourth-class
 
adj
1.  of or relating to mail that is carried at the lowest rate
 
adv
2.  by fourth-class mail

Collins English Dictionary - Complete & Unabridged 10th Edition
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