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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 relating to airmail.
by airmail:
Send all overseas letters airmail.
to send via airmail:
I airmailed the package yesterday.
Historical Examples

Having been in the air mail service in America, he was dropped when demand slackened and fewer men were needed.
Riddle of the Storm Roy J. Snell

In the air mail we used to ‘pull the motors every time they had done 500 hours.
The Flying Reporter Lewis E. (Lewis Edwin) Theiss

For years he had been an air mail pilot and then had established a field of his own for training and commercial flying.
Gypsies of the Air Bess Moyer

They were not in a region frequented by airplanes, nor in the path of an air mail line.
White Fire Roy J. Snell

They were cast as waitresses in the restaurant which served the pilots at the main western terminal of the air mail line.
Janet Hardy in Hollywood Ruthe S. Wheeler

Ted sealed the letter, addressed it, put two stamps on, marked it air mail and turned to the others.
Double Challenge James Arthur Kjelgaard

Then he opened his throttle as far as it would open and went streaking along the air mail route for Ringtown.
The Flying Reporter Lewis E. (Lewis Edwin) Theiss

A revision of air mail rates upon a more systematic and permanent footing is necessary.
State of the Union Addresses of Herbert Hoover Herbert Hoover

And by the way, I suppose you will fly out along the air mail route.
The Flying Reporter Lewis E. (Lewis Edwin) Theiss

He grabbed the air mail; hurried to a train for Chicago, got another plane, and flew the mail through.
Famous Flyers David Goodger ([email protected])

noun
the system of conveying mail by aircraft
mail conveyed by aircraft
adjective
of, used for, or concerned with airmail
verb
(transitive) to send by airmail
n.

also air-mail, 1913, from air (n.1) + mail (n.1).

noun

Garbage thrown out of a window