Etiquette is defined as the formal manners and rules that are followed in social or professional settings.
(noun)The rules of writing a thank you note are an example of etiquette.
See etiquette in Webster's New World College Dictionary
noun
Origin: Fr étiquette, lit., ticket
See etiquette in American Heritage Dictionary 4
noun
Origin:
Origin: French
Origin: , from Old French estiquet, label; see ticket
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