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Meanings of third-class mail in English

Mail consisting of printed matter qualifying for reduced postal rates.

        Usage of third-class mail in English
        1
        Allowing these package humpers to carry first- and third-class mail would make this "suburban tax" disappear.
        Wired
        2
        The technology is akin to bringing the First-, Second-, and Third-Class Mail system of the US Postal Service to the Internet.
        Wired