[noun] [U] - the set of rules or customs which control accepted behaviour in particular social groups or social situations(Social) etiquette dictates that men cannot sit while women are standing.Court life was governed by the most precise form of etiquette.Diplomatic etiquette forbids calling for the death of a national leader.
ETIQUETTE
Meaning of ETIQUETTE in English
Cambridge English vocab. Кембриджский английский словарь. 2012