/ ˈetɪket; NAmE ; -kət/ noun
[ U ] the formal rules of correct or polite behaviour in society or among members of a particular profession :
advice on etiquette
medical / legal / professional etiquette
—see also netiquette
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WORD ORIGIN
mid 18th cent.: from French étiquette list of ceremonial observances of a court, also label, etiquette, from Old French estiquette , from estiquier to fix, from Middle Dutch steken .