Polite fiction

A polite fiction is a social scenario in which all participants are aware of a truth, but pretend to believe in some alternative version of events to avoid conflict or embarrassment. Polite fictions are closely related to euphemism, in which a word or phrase that might be impolite, disagreeable, or offensive is replaced by another word or phrase that both speaker and listener understand to have the same meaning. In scholarly usage, "polite fiction" can be traced to at least 1953.