a letter sent by air mail
Japanese WordNet © 2009-2011 NICT, 2012-2015 Francis Bond, 2016-2024 Francis Bond, Takayuki Kuribayashi
English WordNet © 2006 Princeton University
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Airmail letters were often written on onionskin to reduce postage costs.
航空便は郵便料金を抑えるためによく薄い紙に書かれた。