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 community
双语现象，双重语体（两种语言或一种语言的两种变体并存于一个语言集体中） Word Origin1950s: from Greek diglōssos ‘bilingual’, on the pattern of French diglossie.