A relatively stable linguistic situation in which two different varieties of a single language co-occur in a linguistic community, one (the `high' variety) usually being the more formal and prestigious; the other (the `low') variety being used in more informal settings, chiefly in conversation. Examples: Greek Katharvousa (`high') and Dhimotiki (`low'); Arabic al-fua and al-`amm_yah; in Swiss German: Hochdeutsch and Schwyzerdtsch. In a wider sense also a co-occurrence of two unrelated languages such as Spanish and Guarani in Paraguay.
the situation in which two forms of the same language are spoken by people in the same language community, depending on the social situation.
Diglossia is a situation where there are two versions of a language with very different uses, a High form for official occasions and a Low form for everyday life, as in the difference between High German and Swiss German in German-speaking areas of Switzerland
The existence of "high" (formal) and "low" (informal, familial) dialects of a single language, such as German.
the phenomenon in which different dialects of a language or different languages are spoken by a person in different social situations. Diglossic people may quickly switch back and forth between dialects or languages, depending on the person they are talking to at the time. This is the case with the educated elite of Haiti. They usually speak standard French among themselves but use the Haitian French creole language on the street dealing with poor uneducated Haitians. Diglossia is also referred to as "code switching." dyslexia a brain irregularity that makes it difficult for a reader to connect verbal sounds with the combination of letters that make up a word. Dyslexics often reverse letters and are slow, inefficient readers. Dyslexia can be the result of genetic inheritance or a brain injury to the left temporal lobe. Approximately, 5-15% of Americans are dyslexic to some degree.
the existence of two official languages in a society
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.