http://www.britannica.com/EBchecked/topic/163385/diglossia
diglossia, the coexistence of two varieties of the same language throughout a speech community. Often, one form is the literary or prestige dialect, and the other is a common dialect spoken by most of the population. Such a situation exists in many speech communities throughout the world—e.g., in Greece, where Katharevusa, heavily influenced by Classical Greek, is the prestige dialect and Demotic is the popular spoken language, and in the Arab world, where classical Arabic (as used in the Qurʾān) exists alongside the colloquial Arabic of Egypt, Morocco, and other countries. Sociolinguists may also use the term diglossia to denote bilingualism, the speaking of two or more languages by the members of the same community, as, for example, in New York City, where many members of the Hispanic community speak both Spanish and English, switching from one to the other according to the social situation or the needs of the moment.
It is important to point out that diglossia is different from bilingualism as we learn in Calvet's text "Language wars and linguistic politics" from 1998. The basic ideia he explains to us is that we use the term diglossia to denominate a social biligualism and we use the term bilingualism to denominate the individual bilingualism.
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