O trecho a seguir, extraído do livro English as a global language de David Crystal [1997], 2003, é referência para a questão.

What is a global language?

“A language achieves a genuinely global status when it develops a special role that is recognized in every country. This might seem like stating the obvious, but it is not, for the notion of ‘special role’ has many facets. Such a role will be most evident in countries where large numbers of the people speak the language as a mother tongue – in the case of English, this would mean the USA, Canada, Britain, Ireland, Australia, New Zealand, South Africa, several Caribbean countries and a sprinkling of other territories. However, no language has ever been spoken by a mother-tongue majority in more than a few countries (Spanish leads, in this respect, in some twenty countries, chiefly in Latin America), so mother-tongue use by itself cannot give a language global status. To achieve such a status, a language has to be taken up by other countries around the world. They must decide to give it a special place within their communities, even though they may have few (or no) mother-tongue speakers.

There are two main ways in which this can be done. Firstly, a language can be made the official language of a country, to be used as a medium of communication in such domains as government, the law courts, the media, and the educational system. To get on in these societies, it is essential to master the official language as early in life as possible. Such a language is often described as a ‘second language’, because it is seen as a complement to a person’s mother tongue, or ‘first language’. The role of an official language is today best illustrated by English, which now has some kind of special status in over seventy countries, such as Ghana, Nigeria, India, Singapore and Vanuatu. This is far more than the status achieved by any other language – though French, German, Spanish, Russian and Arabic are among those which have also developed a considerable official use. New political decisions on the matter continue to be made: for example, Rwanda gave English official status in 1996.

Secondly, a language can be made priority in a country’s foreign-language teaching, even though this language has no official status. It becomes the language which children are most likely to be taught when they arrive in school, and the one most available to adults who – for whatever reason – never learned it, or learned it badly, in their early educational years. Russian, for example, held privileged status for many years among the countries of the former Soviet Union. Mandarin Chinese continues to play an important role in South-east Asia. English is now the language most widely taught as a foreign language – in over 100 countries, such as China, Russia, Germany, Spain, Egypt and Brazil – and in most of these countries it is emerging as the chief foreign language to be encountered in schools, often displacing another language in the process. In 1996, for example, English replaced French as the chief foreign language in schools in Algeria (a former French colony).

In reflecting on these observations, it is important to note that there are several ways in which a language can be official. It may be the sole language of a country, or it may share this status with other languages. And it may have a ‘semi-official’ status, being used only in certain domains, or taking second place to other languages while still performing certain official roles. Many countries formally acknowledge a language’s status in their constitution (e.g. India); some make no special mention of it (e.g. Britain). In certain countries, the question of whether the special status should be legally recognized is a source of considerable controversy – notably, in the USA.” (. . .)

(CRYSTAL, David. English as a global Language. Cambridge: CUP, [1997] 2003, p. 03-05.)

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