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New American Oxford Dictionary

fourth-class

fourth-class ▶adjective a class of US mail applying to packages weighing more than sixteen ounces and used esp. for sending general merchandise, books, recordings, and films.

 

Oxford Dictionary

fourth-class

fourth-class ▶adjective a class of US mail applying to packages weighing more than sixteen ounces and used esp. for sending general merchandise, books, recordings, and films.