Definition of fourth-class in English:

fourth-class

Syllabification: fourth-class

Entry from US English dictionary

adjective

A class of US mail applying to packages weighing more than sixteen ounces and used especially for sending general merchandise, books, recordings, and films.

Definition of fourth-class in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal