the system, especially a government postal system, of sending mail by airplane.
a letter, package, etc., sent by this system.
a stamp authorizing delivery of mail by this system.
of or pertaining to airmail.
by airmail: Send all overseas letters airmail.
verb (used with object)
to send via airmail: I airmailed the package yesterday.
Also, air-mail.

1910–15; air1 + -mail1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
airmail (ˈɛəˌmeɪl)
1.  the system of conveying mail by aircraft
2.  mail conveyed by aircraft
3.  of, used for, or concerned with airmail
4.  (tr) to send by airmail

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica


letters and parcels transported by airplanes. Airmail service was initiated in 1911 in England between Hendon (northwest of London) and Windsor, to celebrate the coronation of George V. Service was irregular, however, and only 21 trips were made. Continuous regular air transport of letters between London and Paris was established in 1919, and a similar service for parcels in 1921. Other European air links soon followed. Regular airmail service in the United States was begun in 1918 between Washington, D.C., and New York City, using War Department planes and pilots. The first transcontinental airmail service was established in 1920, between San Francisco and New York City.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Once airmail became accepted, the government transferred airmail service to
  private companies.
Airmail items receive preferential customs treatment and are submitted to
  customs separately from surface mail.
Early economic regulation of airlines by the government concerned mainly their
  participation in the airmail system.
As the system of airmail routes expanded, pilots began keeping notebooks they
  could fit in their pockets or hold in their hand.
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