An airmail etiquette, often shortened to just etiquette, is a label used to indicate that a letter is to be sent by airmail. The term is from French étiquette "label, sticker" (cognate to stick), from which also English etiquette "rules of behavior".
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Famous quotes containing the word etiquette:
“The etiquette of romantic love is as elaborate as that surrounding the Emperor of China.”
—Mason Cooley (b. 1927)