noun, plural: cultural diversities
A good way to quantify or estimate cultural diversity is to count the number of languages spoken regionally or globally. Accordingly, there is an abrupt decline of language use, which may indicate a decline in the world's cultural diversity. Overpopulation, immigration and imperialism (of both the militaristic and cultural kind) are some of the reasons believed to explain any such decline.
Word origin: cultural » culture: Latin cultūra, from cultus, past participle of colere; diversity: Latin dīversitās.