Multiculturalism (Sociology) describes the way a given society deals with cultural diversity. Based on the underlying assumption that members of often very different cultures can coexist peacefully, multiculturalism expresses the view that society is enriched by preserving, respecting, and even encouraging cultural diversity.
Multiculturalism (political Science) refers to the ways in which societies choose to formulate and implement official policies dealing with the equitable treatment of different cultures.
Multicultural Societies (Application) are characterized by people of different races, ethnicities, and nationalities living together in the same community. In multicultural communities, people retain, pass down, celebrate, and share their unique cultural ways of life, languages, art, traditions, and behaviors.
Cultural Pluralism (Sociology) 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.
Classical Pluralism (Sociology) is the view that politics and decision making are located mostly in the framework of government, but that many non-governmental groups use their resources to exert influence. The central question for classical pluralism is how power and influence are distributed in a political process.
Pluralist Democracy (Sociology) describes a political system where there is more than one center of power. Democracies are pluralist as democracies allow freedom of association. However, pluralism may exist without democracy.
Multiculturalism is more related to the ethnic cultures of the given societies (mostly different) while pluralism deals with the acceptance of varied ideas in the same society.