Language spoken by a numerically smaller population and/or to the language spoken by a politically marginalized population whatever its size (…). In the second case, the term minoritized language is sometimes used (Bühmann and Trudell, 2008: 6).
The OECD (…) distinguishes between three main groups of ethnic minorities, namely: migrant groups in societies; minority indigenous populations; and historically disadvantaged groups (e.g. African-Americans, gypsies, etc.). Another important distinction is official minority language groups (e.g. the French-speaking region in Canada, the Swedish-speaking community in Finland, the French and Italian-speaking regions in Switzerland, etc.) (Desjardins, Rubenson and Milana, 2006: 73).