linguistic:voice_change, stylistic:style_transfer, structural:summarization
Definition

The definition of multilingualism is a subject of debate in the same way as that of language fluency. At one end of the linguistic continuum, multilingualism may be defined as the mastery of more than one language. The speaker would have knowledge of and control over the languages equivalent to that of a native speaker. At the opposite end of the spectrum would be people who know enough phrases to get around as a tourist using the alternate language. Since 1992, Vivian Cook has argued that most multilingual speakers fall somewhere between minimal and maximal definitions. Cook calls these people multi-competent.

In addition, there is no consistent definition of what constitutes a distinct language. For instance, scholars often disagree whether Scots is a language in its own right or merely a dialect of English. Furthermore, what is considered a language can change, often for purely political reasons. One example is the creation of Serbo-Croatian as a standard language on the basis of the Eastern Herzegovinian dialect to function as umbrella for numerous South Slavic dialects; after the breakup of Yugoslavia, it was split into Serbian, Croatian, Bosnian and Montenegrin. Another example is the historical dismissal of Ukrainian as a Russian dialect by the Russian tsars to discourage national feelings. Many small independent nations' schoolchildren are today compelled to learn multiple languages because of international interactions. For example, in Finland, all children are required to learn at least three languages: the two national languages (Finnish and Swedish) and one foreign language (usually English). Many Finnish schoolchildren also study further languages, such as German or Russian.

In some large nations with multiple languages, such as India, schoolchildren may routinely learn multiple languages based on where they reside in the country.

In many countries, bilingualism occurs through international relations, which, with English being a global lingua franca, sometimes results in majority bilingualism even when the countries in question have just one domestic official language. This occurs especially in regions such as Scandinavia and the Benelux, as well as among Germanophones, but the phenomenon has also been expanding into some non-Germanic countries.