Pluralistic ignorance
In social psychology, pluralistic ignorance is a situation in which a majority of group members privately reject a norm, but go along with it because they incorrectly assume that most others accept it. This is also described as "no one believes, but everyone thinks that everyone believes". In short, pluralistic ignorance is a bias about a social group, held by the members of that social group.
Cultural pluralism
Cultural pluralism is a term used when smaller groups within a larger society maintain their unique cultural identities, and their values and practices are accepted by the wider culture provided they are consistent with the laws and values of the wider society. As a sociological term, the definition and description of cultural pluralism has evolved over time. It has been described as not only a fact but a societal goal. Cultural pluralism is distinct from (though often confused with) multiculturalism. Multiculturalism lacks the requirement of a dominant culture. If the dominant culture is weakened, societies can easily pass from cultural pluralism into multiculturalism without any intentional steps being taken by that society. If communities function separately from each other, or compete with one another, they are not considered culturally pluralistic.