Etymology
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aerogram (n.)

also aerogramme, 1899, "message sent through the air" (by radio waves, i.e. "wireless telegraphy"), from aero- + -gram. From 1920 as "air-mail letter."

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Definitions of aerogram

aerogram (n.)
a letter sent by air mail;
Synonyms: airmail letter / air letter / aerogramme
From wordnet.princeton.edu