/ daɪˈglɒsiə; NAmE -ˈglɔːs-; -glɑːs-/ noun
[ U ] ( linguistics ) a situation in which two languages or two forms of a language are used under different conditions in a community
► di·glos·sic adjective
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WORD ORIGIN
1950s: from Greek diglōssos bilingual, on the pattern of French diglossie .