第だい四よん種しゅ郵ゆう便びん物ぶつ

noun

fourth-class mail

A category of domestic mail in Japan for certain printed materials, educational materials, and other specified items, offering lower postage rates.

• 第だい四よん種しゅ郵ゆう便びん物ぶつは、通つう信しん教きょう育いくの教きょう材ざいなどに利り用ようされる。

  Fourth-class mail is used for correspondence course materials and the like.