Jisho

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Noun
1. aerogramme; air letter
Wikipedia definition
2. AerogramAn Aerogram, Aérogramme or Air Letter is a thin lightweight piece of foldable and gummed paper for writing a letter for transit via airmail, in which the letter and envelope are one and the same. Most postal administrations forbid enclosures in these light letters, which are usually sent abroad at a preferential rate. Printed warnings existed to say that an enclosure would cause the mail would go at the higher letter rate.
Read “Aerogram” on English Wikipedia
Read “航空書簡” on Japanese Wikipedia
Read “Aerogram” on DBpedia

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