A lightweight letter designed for airmail delivery, typically a single sheet that folds to create its own envelope.
From 'aero-' (air) plus Greek 'gram' (written, letter). This term emerged during early airmail services when special lightweight stationery was needed to reduce weight and postage costs.
Aerograms were the precursor to email—they were the high-tech marvel of mid-20th century communication, letting people send messages across continents in days instead of weeks, with minimal weight and maximum style!
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