Diglossia
situation in which two dialects or languages are used by a single language community
Diglossia is when a group of people have two languages or dialects that they use. One is the common language they use every day, and the other is either a much older version from centuries before (for example, Arabic or Chinese) or a similar but clearly different modern-day version (for example, Norwegian with Bokmål and Nynorsk).
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