Jisho

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Noun
1. post office boxAbbreviation, See also 郵便私書箱
Wikipedia definition
2. Post-office boxA post-office box or Post Office box (commonly referred to as a PO Box or a Postal Box) is a uniquely addressable lockable box located on the premises of a post office station. In many countries, particularly in Africa, and the Middle East there is no 'door to door' delivery of mail. For example, should one post mail to a street address in Namibia, it will be returned to sender as undeliverable.
Read “Post-office box” on English Wikipedia
Read “私書箱” on Japanese Wikipedia
Read “Post-office box” on DBpedia

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