first-class mail

  1. mail that includes letters and postcards and packages sealed against inspection
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How To Use first-class mail In A Sentence

  • On-time is defined as overnight delivery of first-class mail within major cities.
  • Send it by first-class mail.
  • The fourth-class zone rated parcels and first-class mail have virtually identical historical elasticities.
  • The print material is sent via first-class mail the same day the video is sent via third-class mail.
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