[dahy-glos-ee-uh, -glaw-see-uh]
the widespread existence within a society of sharply divergent formal and informal varieties of a language each used in different social contexts or for performing different functions, as the existence of Katharevusa and Demotic in modern Greece.
Pathology. the presence of two tongues or of a single tongue divided into two parts by a cleft.

1955–60; Latinization of French diglossie, equivalent to Greek díglōss(os) speaking two languages (see diglot) + French -ie -y3

diglossic [dahy-glos-ik] , adjective
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World English Dictionary
diglossia (daɪˈɡlɒsɪə)
linguistics the existence in a language of a high, or socially prestigious, and a low, or everyday, form, as German and Swiss German in Switzerland
[C20: New Latin, via French, from Greek diglōssos speaking two languages: see diglot]

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American Heritage
Medical Dictionary

diglossia di·glos·si·a (dī-glŏs'ē-ə)
See bifid tongue.

The American Heritage® Stedman's Medical Dictionary
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