diglossia
noun/daɪˈɡlɒsiə/
/daɪˈɡlɑːsiə/
[uncountable] (linguistics)- a situation in which two languages or two forms of a language are used under different conditions in a communityWord Origin1950s: from Greek diglōssos ‘bilingual’, on the pattern of French diglossie.
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diglossia