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In linguistics, diglossia is a situation where, in a given society, there are two (often) closely-related languages, one of high prestige, which is generally used by the government and in formal texts, and one of low prestige, which is usually the spoken vernacular tongue. The high-prestige language tends to be the more formalised, and its forms and vocabulary often 'filter down' into the vernacular, though often in a changed form. As an aspect of study of the relationships between codes and social structure, diglossia is an important concept in the field of sociolinguistics.