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Noun: third-class mail
  1. Mail consisting of printed matter qualifying for reduced postal rates
    - third class

Type of: mail

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third person
third power
third rail
Third Reich
third sacker
third stomach
third tonsil
third trimester
third ventricle
Third World
third-class mail
third-degree burn
third-dimensional
third-dimensionality
thirdhand
thirdly
third-place finish
third-rate
third-rater
third-year
thirst