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third-class mail

Definitions of third-class mail
  1. noun
    mail consisting of printed matter qualifying for reduced postal rates
    synonyms: third class
    see moresee less
    types:
    junk mail
    third-class mail consisting of advertising and often addressed to `resident' or `occupant'
    type of:
    mail
    the bags of letters and packages that are transported by the postal service
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