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The term ''multilingual''' can refer to an individual speaker who uses two or more [[languages]], a community of speakers in which two or more languages are used, or speakers of different languages. 

Multilingual speakers outnumber [[monolingual]] speakers in the world's population.<ref>http://www.cal.org/resources/Digest/digestglobal.html A Global Perspective on Bilingualism and Bilingual Education (1999),
G. Richard Tucker, Carnegie Mellon University</ref>

==Multilingual individuals==
A '''multilingual''' person, in a broad definition, is one who can communicate in more than one language, be it actively (through speaking, writing, or signing) or passively (through listening, reading, or perceiving). More specifically, the terms ''bilingual'' and ''trilingual'' are used to describe comparable situations in which two or three languages are involved. A generic term for multilingual persons is ''polyglot''.

Multilingual speakers have acquired and maintained at least one language during childhood, the so-called [[first language]] (L1). The first language (sometimes also referred to as the mother tongue) is acquired without formal education, by mechanisms heavily disputed. Children acquiring two languages in this way are called simultaneous bilinguals. Even in the case of simultaneous bilinguals one language usually dominates over the other. This kind of bilingualism is most likely to occur when a child is raised by bilingual parents in a predominantly monolingual environment. It can also occur when the parents are monolingual but have raised their child or children in two different countries.

===Definition of multilingualism===
One group of academics{{Fact|date=November 2008}} argues for the maximal definition which means speakers are as proficient in one language as they are in others and have as much knowledge of and control over one language as they have of the others. Another group of academics argues for the minimal definition, based on use. Tourists, who successfully communicate phrases and ideas while not fluent in a language, may be seen as bilingual according to this group.

However, problems may arise with these definitions as they do not specify how much knowledge of a language is required to be classified as bilingual. As a result, since most speakers do not achieve the maximal ideal, language learners may come to be seen as deficient and by extension, language teaching may come to be seen as a failure. One does not expect children to "speak chemistry" or to have become a professional athlete by the time they have left school, yet for graduating school children anything less than fluency in a second language could be seen as inadequate{{Fact|date=November 2008}}. 

Since 1992, Cook has argued that most multilingual speakers fall somewhere between minimal and maximal definitions. Cook calls these people ''multi-competent''.

===Learning language===
A broadly held, yet nearly as broadly criticised{{Fact|date=November 2008}}, view is that of the United States [[linguistics|linguist]] [[Noam Chomsky]] in what he calls the human '''[[language acquisition device]]'' '— a mechanism which enables an individual to recreate correctly the rules (grammar) and certain other characteristics of language used by speakers around the learner.<ref name="Santrock">Santrock, John W. (2008).  Bilingualism and Second-Language Learning.  ''A Topical Approach to Life-Span Development (4Th ed.)'' (pp. 330-335).  New York, NY: McGraw-Hill Companies, Inc.</ref>  This device, according to Chomsky, wears out over time, and is not normally available by [[puberty]], which he uses to explain the poor results some adolescents and adults have when learning aspects of a [[second language]] (L2).   

If language learning is a [[cognitive process]], rather than a language acquisition device, as the school led by [[Stephen Krashen]] suggests, there would only be relative, not categorical, differences between the two types of language learning.

Despite the differences in theories, most studies agree that the earlier children learn a second language, the better off they are, cognitively speaking at least.  These studies could be used to make the learning of a second language mandatory in all schools as early as possible, in order to give children every means of increasing their cognitive abilities.  Many European schools offer secondary language classes for their students, if for no other reason than the proximity of other countries with different languages.  The United States, however, in spite of its proximity to francophone Quebec and hispanophone Mexico, is the only technologically advanced country that does not require the study of a foreign language in its schools.<ref name="Santrock" />

===Comparing multilingual speakers===
Even if someone is highly proficient in two or more languages, his or her so-called ''communicative competence'' or ability may not be as balanced. Linguists have distinguished various types of multilingual competence, which can roughly be put into two categories:

*For ''compound'' bilinguals, words and phrases in different languages are the same concepts. That means that 'chien' and 'dog' are two words for the same concept for a [[French language|French]]-[[English language|English]] speaker of this type. These speakers are usually fluent in both languages.

*For ''coordinate'' bilinguals, words and phrases in the speaker's mind are all related to their own unique concepts. Thus a bilingual speaker of this type has different associations for 'chien' and for 'dog'. In these individuals, one language, usually the first language, is more dominant than the other, and the first language may be used to ''think through'' the second language. These speakers are known to use very different intonation and pronunciation features, and sometimes to assert the feeling of having different personalities attached to each of their languages.

:*A sub-group of the latter is the ''subordinate'' bilingual, which is typical of beginning second language learners.

The distinction between compound and coordinate bilingualism has come under scrutiny. When studies are done of multilinguals, most are found to show behavior intermediate between compound and coordinate bilingualism. Some authors have suggested that the distinction should only be made at the level of grammar rather than vocabulary, others use "coordinate bilingual" as a synonym for one who has learned two languages from birth, and others have proposed dropping the distinction altogether (see Baetens-Beardsmore, 1974 for discussion).

Many theorists are now beginning to view bilingualism as a "spectrum or continuum of bilingualism" that runs from the relatively monolingual language learner to highly proficient bilingual speakers who function at high levels in both languages (Garland, 2007).

====Cognitive proficiency====
{{Main|Cognitive advantages to bilingualism}}
Those bilinguals who are highly proficient in two or more languages, such as compound and coordinate bilinguals, are reported to have a higher cognitive proficiency, and are found to be better language learners (third, fourth, etc.) at a later age, than monolinguals.{{Fact|date=February 2007}} The early discovery that concepts of the world can be labelled in more than one fashion puts those bilinguals in the lead. 

There is, however, also a phenomenon known as ''distractive bilingualism'' or '''semilingualism'''. When acquisition of the first language is interrupted and insufficient or unstructured language input follows from the second language, as sometimes happens with [[immigrant]] children, the speaker can end up with two languages both mastered below the monolingual standard. The vast majority of immigrant children, however, acquire both languages normally{{Fact|date=November 2008}}.

In [[Japan]], it has been found that a large number of older immigrant children, whose parents have come from other Asian nations or South America to work in Japanese factories and whose first language is seen by society at large as less prestigious than [[Japanese language|Japanese]], were able to communicate with other children in the school grounds but were unable to master the language necessary for learning in the school system.{{Fact|date=February 2007}} As a result, thousands of these children have dropped out of the school system, without mastering either their first or second language.{{Fact|date=February 2007}} While community activists have long called for government help, only in the past few years has the Japanese Ministry of Education slowly begun to  study this issue. 

Literacy plays an important role in the development of language in these immigrant children. Those who were literate in their first language before arriving in Japan, and who have support to maintain that literacy, are at the very least able to maintain and master their first language. 

The neuroscientist [[Katrin Amunts]] studied the brain of [[Emil Krebs]] and determined that the area of Krebs' brain responsible for language &mdash; [[Broca's area]] &mdash; was organized differently from monolingual men.<ref>[http://www.michaelerard.com/fulltext/2006/08/gift_of_the_gab_new_scientist.html Gift of the Gab, New Scientist, January 8, 2005 (Michael Erard - Stories)<!-- Bot generated title -->]</ref>

===Receptive bilingualism===
Receptive bilinguals are those who have the ability to understand a language, but do not speak it. Receptive bilingualism may occur when a child realizes that the community language is more prestigious than the language spoken within the household and chooses to speak to their parents in the community language only. Families who adopt this mode of communication can be highly functional, although they may not be seen as bilingual. Receptive bilinguals may rapidly achieve oral fluency when placed in situations where they are required to speak the heritage language.

Receptive bilingualism is not the same as [[mutual intelligibility]], which is the case of a native Spanish speaker who is able to understand Portuguese, or vice versa, due to the high lexical and grammatical similarities between Spanish and Portuguese [http://www.ethnologue.com/show_language.asp?code=spa].

===Potential multilingual speakers===

*Natives under a State in which they do not share the predominant language, such as [[Welsh people]] within the [[United Kingdom]].
*People with a strong interest in a foreign language.
*People who find it necessary to acquire a second language for practical purposes such as business, information gathering (Internet, mainly English) or entertainment (foreign language films, books or computer games).
*[[Language immersion]] children.
*Immigrants and their descendants. Although the [[home language|heritage language]] may be [[language attrition|lost]] after one or two generations, particularly if the replacing language has greater prestige.
*Children of [[expatriate]]s. However, [[language attrition|language loss]] of the L1 or L2 in younger children may be rapid when removed from a language community.
*Residents in border areas between two countries with different languages, where each language is seen as of equal prestige: efforts may be made by both language communities to acquire an L2. Yet, in areas where one language is more prestigious than the other, speakers of the less [[prestige (sociolinguistics)|prestigious language]] may acquire the [[dominant language]] as an L2. In time, however, the different language communities may reduce to one, as one language becomes [[Language death|extinct]] in that area.
*Children whose parents each speak a different language, in multilingual communities. In monolingual communities, when parents maintain a different-parent/different-language household, younger children may appear to be multilingual; however entering school will overwhelm the child with pressure to conform to the dominant community language. Younger siblings in these households will almost always be monolingual. On the other hand, in monolingual communities, where parents have different L1s, multilingualism in the child may be achieved when both parents maintain a one-language (not the community language) household.
*Children in language-rich communities where neither language is seen as more prestigious than the other and where interaction between people occurs in different languages on a frequent basis.  An example of this would be some border towns in [[Québec]], but English is rapidly becoming seen as the more "prestigious" language by some.
*Children who have one or more parents who have learned a second language, either formally (in classes) or by living in the country. The parent chooses to speak only this second language to the child.  One [http://www.bilingualwiki.com/index.php?title=Research_has_been_done study] suggests that during the teaching process, the parent also boosts his or her own language skills, learning to use the second language in new contexts as the child grows and develops linguistically.
*People who learn a different language for religious reasons. (see: [[Sacred language]])

===Polyglots===

A person who speaks several languages is called a polyglot. The following claimed to speak ten or more languages:

*[[Mahapandit Rahul Sankrityayan]]<ref name="Sharma 2009">{{स्रोत पुस्तक
| पहिलेनाव = R.S.
| आडनाव = Sharma
| लेखकदुवा = R.S. Sharma
| शीर्षक = [[Rethinking India's Past]]
| प्रकाशक = [[Oxford University Press]]
| वर्ष = 2009
| आयएसबीएन = 978-0195697872
}}</ref> - knew 36 languages and wrote in a number of them.<ref name="Sharma 2009"/>
*[[Abdulaziz Sachedina]] - speaks [[Hindi]], [[उर्दू भाषा]], [[French language|French]], [[Persian language|Persian]], [[Arabic]], [[Gujrati]], [[Swahili]], [[English language|English]], Modern [[Turkish language|Turkish]] and [[German language|German]].<ref>http://artsandsciences.virginia.edu/religiousstudies/people/aas.html</ref>
*[[Pramod Kumar Agarwal]] - at age 25 years speaks [[Hindi]], [[English language|English]], [[French language|French]], [[Bangali]], [[Gujrati]], [[Romanian]], [[Marwari]], [[Dutch language|Dutch]] .
*[[Ali Ufki]] - mastered 16 languages.
*[[Ziad Fazah]]<ref>http://thelinguistblogger.wordpress.com/2008/05/25/the-many-languages-of-ziad-fazah/</ref> - claims to speak 59 languages.
*[[Andrew Brown]] <ref>http://thegln.org/GLN_National/inner_content.php?id=Mg==&pi=WWA</ref> - confident in 22 languages.
*[[Muhammad Hamidullah]]<ref>http://muslim-canada.org/memoriam2.html</ref> - fluent in 22 languages.
*[[Alexander Arguelles]]<ref>http://www.foreignlanguageexpertise.com/about.html#ml</ref> - "systematically studies" 58+ languages.
*[[P.V. Narasimha Rao]]<ref>[http://www.hindu.com/2006/12/20/stories/2006122019110200.htm Tribute to Narasimha Rao]. ''[[The Hindu]]''. Retrieved on [[March 2]] [[2007]]</ref><ref name ="Telegraph">[http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2004/12/24/db2401.xml&sSheet=/portal/2004/12/24/ixportal.html Narasimha Rao]. ''[[The Daily Telegraph]]''. Retrieved on [[March 2]] [[2007]]</ref> - knowledge of 13 languages.
*[[Richard Simcott]]<ref name="youtube.com">http://www.youtube.com/watch?v=SAtWuQmdexs&feature=channel_page</ref> - can communicate orally in 14 languages and use around 20 in their written form.
*[[Sir John Bowring]]<ref>http://www25.uua.org/uuhs/duub/articles/sirjohnbowring.html</ref> - reportedly spoke 100 languages, with knowledge of 200+.
*[[Giuseppe Mezzofanti]]<ref>http://how-to-learn-any-language.com/e/mezzofanti/language-table.html</ref> - perfect knowledge of 38 languages and about 30 dialects.
*[[Heinrich Schliemann]]<ref name="Poole">Poole, Lynn and Gray (1966). ''One Passion, Two Loves''</ref> - conversant in 13 languages.
*[[José Rizal]]<ref>http://www.lewrockwell.com/orig/witmer1.html</ref> - "competent" in 22 languages.
*[[Harold Williams (linguist)|Harold Williams]]<ref>http://www.nzedge.com/heroes/williams.html</ref> - fluent in 58 languages.
*[[Emil Krebs]]<ref>http://www.weikopf.de/index.php?article_id=188</ref> - mastered 68 languages in speech and writing.
*[[Uku Masing]]<ref>http://www.vm.ee/est/kat_29/3909.html</ref> - knowledge of 65 languages.
*[[Kenneth Hale]]<ref>http://www.anu.edu.au/linguistics/nash/aust/hale/sjk.html</ref> - knowledge of 50+ languages.
* [[Mario Pei]] - spoke 35 languages; acquainted with the structure of at least 100 of the world's languages.
*[[Daniel Tammet]]<ref>http://www.nytimes.com/2007/02/15/garden/15savant.html?pagewanted=1&ei=5124&en=3d3b2a9871935a79&ex=1329368400&partner=digg&exprod=digg</ref> - speaks 10+ languages.
*[[Pope Benedict XVI]] - Fluent in 10+ languages.
*[[Richard Francis Burton]]<ref>Lovell (1998), p. xvii.</ref> - spoke 29 languages.
*[[Barry Farber]]<ref>http://www.meadowparty.com/farber.html</ref> - "student" of 26 languages.
*[[Paul Robeson]]<ref>http://www.paulrobesonfoundation.org/biography.html</ref> - study of 20+ languages.
*[[Kató Lomb]] - highly proficient in 17 languages.
*[[Bjørn Clasen]]<ref>http://clasen.blogspot.com</ref> speaks 10 languages on at least conversation level, not counting dialects.
*[[Edgardo Donovan]]<ref>http://www.eddiedonovan.com/edgardolife.htm</ref> - 9 languages and/or 16 dialects - certified by the Defense Language Institute.
*[[İlber Ortaylı]] - can speak 16 languages fluently, knows more than 16 languages.
*[[J.R.R. Tolkien]] -fluent in 13, yet knew 12 others, not including his [[Languages of Middle-earth|self constructed languages]].<ref>http://www.tolkiensociety.org/tolkien/biography.html</ref><ref>http://www.langmaker.com/ml0108.htm</ref>
*[[Hans Conon von der Gabelentz]]
*[[Maria Gaetana Agnesi]]
*[[Pope John Paul II]] - Spoke ten languages fluently, and had a grasp of several more.
*[[Anthony Burgess]]
*[[William James Sidis]] - knew 8 languages and invented his own, [[Vendergood]], by the time he was eight.  It is believed that he knew forty or so languages in his later years and supposedly could learn a language in a day.<ref>Wallace, Amy (1986). The prodigy: a biography of William James Sidis, America's greatest child prodigy. New York: E.P. Dutton & Co. p. 284 ISBN 0-525-24404-2.</ref>
*[[Frederick Engels]] - knew 12 languages <ref>http://www.marxists.org/archive/riazanov/works/1927-ma/ch09.htm</ref>
*[[Steve Kaufmann]] - speaks twelve languages to varying degrees of fluency: [[Cantonese]], [[English language|English]], [[French language|French]], [[German language|German]], [[Italian language|Italian]], [[Japanese language|Japanese]], [[Korean language|Korean]], [[Mandarin]], [[Portuguese language|Portuguese]], [[Russian language|Russian]], [[Spanish language|Spanish]] and [[Swedish language|Swedish]].<ref>{{संकेतस्थळ स्रोत | लेखक= Tatiana Fanti | शीर्षक=Podcast Café Brasil Vira Conteúdo de Site Americano | प्रकाशक=SEGS | दुवा=http://www.segs.com.br/index.php?option=com_content&task=view&id=24678&Itemid=177 | आर्काइव्हदुवा=http://www.segs.com.br/index.php?option=com_content&task=view&id=24678&Itemid=177 | आर्काइव्हदिनांक=2009-08-29}}</ref><ref>{{संकेतस्थळ स्रोत | लेखक= Windsor Star | शीर्षक= Language websites are a growing trend | प्रकाशक=Canada.com | दुवा=http://www.canada.com/windsorstar/news/business/story.html?id=5fcf1664-2f8d-41a4-9e73-4f045c7f07f5 | आर्काइव्हदुवा=http://www.canada.com/windsorstar/news/business/story.html?id=5fcf1664-2f8d-41a4-9e73-4f045c7f07f5 | आर्काइव्हदिनांक=2009-08-29}}</ref><ref>{{संकेतस्थळ स्रोत|दुवा=http://toshuo.com/2007/steve-kaufmann-bilingual-interview-in-taiwan/ |शीर्षक=Steve Kaufmann – Bilingual Interview in Taiwan &#124; Doubting to shuo: Chinese, Investing, EFL and Being a Geek in Taiwan |प्रकाशक=Toshuo.com |दिनांक=2007-01-29 |अ‍ॅक्सेसदिनांक=2009-08-31}}</ref>

*[[Damodar Dharmanand Kosambi]]
*[[Vyacheslav Menzhinsky]] - spoke over ten languages, including Korean, Chinese, Turkish, Persian<ref>http://books.google.com/books?id=PbWp68vV6ysC&pg=PA674&lpg=PA674&dq=%D0%9C%D0%B5%D0%BD%D0%B6%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9,+%D0%92%D1%8F%D1%87%D0%B5%D1%81%D0%BB%D0%B0%D0%B2+%D1%8F%D0%B7%D1%8B%D0%BA%D0%B0%D0%BC%D0%B8&source=bl&ots=1WpANlSNSJ&sig=UZ6oC3xOAp6jcHg0qiRqMFRfnsU&hl=en&ei=qAicSqLXN8OF-Qbq-d2OBA&sa=X&oi=book_result&ct=result&resnum=3</ref>.
*[[Matija Čop]] - able to speak 19 languages.
*[[Irika Rositano]]<ref name="youtube.com"/> - Knows 12 Languages
*[[Akyol]]<ref>http://www.volny.cz/akyol/linguistics.htm</ref> - knowledge of more than 30 languages.
*[[Sukarno]]<ref>Ludwig M., Arnold (2004). ''King of the Mountain: The Nature of Political Leadership''. University Press of Kentucky. [http://books.google.com/books?id=WWCZuYw_0dIC&pg=PA150&dq=Sukarno%2Bprecocious&as_brr=3&ei=M_W0SZPVDYLeyATPtvXyCg&hl=fr#PPA150,M1 p. 150].</ref>
*[[Alessandro Bausani]]<ref>http://it.wikipedia.org/wiki/Alessandro_Bausani</ref> - Italian orientalist who knew more than 30 languages
*[[Jacques Bergier]] - French chemical engineer, spy, journalist, writer etc. spoke 14 languages fluently.
*Ali pirhani Hamedan,I.R.Iran ,spoke 19 languages fluently [http://www.pirhani.ir]

===Definition of "language"===

There is no clear definition of what it means to "speak a language". A tourist who can handle a simple conversation with a waiter may be completely lost when it comes to discussing current affairs or even using multiple tenses. A diplomat or businessman who can handle complicated negotiations in a foreign language may not be able to write a simple letter correctly. A four-year-old French child would usually be said to "speak [[French language|French]] fluently", but it is possible that he cannot handle the grammar as well as even some mediocre foreign students of the language do and may have a very limited vocabulary despite possibly having perfect pronunciation.

In addition there is no clear definition of what "one language" means. For instance the [[North Germanic languages|Scandinavian languages]] are so similar that many of the native speakers understand all of them without much trouble{{Fact|date=November 2008}}. This means that a speaker of Danish, Norwegian or Swedish can easily get his count up to 3 languages. On the other hand, the differences between variants of Chinese, like [[Cantonese]] and [[Mandarin (linguistics)|Mandarin]], are so big that intensive studies are needed for a speaker of one of them to learn and even to understand a different one correctly. A person who has learned to speak five [[Chinese language|Chinese]] ''dialects'' perfectly is quite accomplished{{Weasel-inline|date=March 2009}}, but his "count" would still be only one ''language'', and some would argue that the differences between these dialects are greater than the differences between many European Romance languages.

As another example, a person who has learned five different languages such as [[French language|French]], [[Spanish language|Spanish]], [[Catalan language|Catalan]], [[Italian language|Italian]] and [[Portuguese language|Portuguese]], all belonging to the closely related group of [[Romance languages]], has accomplished something less difficult than a person who has learnt [[Hebrew language|Hebrew]], [[Standard Mandarin]], [[Finnish language|Finnish]], [[Navajo Language|Navajo]] and [[Welsh language|Welsh]], of which none is remotely related to another.

Furthermore, what is considered a language can change, often for purely political purposes, such as when [[Serbo-Croatian]] was assembled from [[Serbian language|Serbian]] and [[Croatian language|Croatian]] and later split after [[Yugoslavia]] broke up, or when [[Ukrainian language|Ukrainian]] was dismissed as a Russian dialect by the Russian [[tsars]] to discourage national feelings.<ref>[[Ems Ukaz]]</ref>

==Multilingualism within communities==
{{See|List of multilingual countries and regions}}
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[[File:Multilingual sign in Macau.png|thumb|This is a [[multilingual sign]] at the [[Hong Kong-Macau Ferry Pier]] in the [[Macau|Macau Special Administrative Region]] of [[People's Republic of China|China]]. The two at the top are [[Portuguese language|Portuguese]] and [[Chinese languages|Chinese]], which are the [[official language]]s of the region. The two at the bottom are [[Japanese language|Japanese]] and [[English language|English]], which are common languages used by [[tourist]]s.]]
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[[File:MultilingualismEnglishKannadaHindi.jpg|thumb|A caution message in [[English language|English]], [[Kannada]] and [[Hindi]] found in [[बंगळुरू]], [[India]]]]
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[[File:Trisulam railway station nameboard.JPG|thumb|The three language ([[Tamil language|Tamil]], [[English language|English]] and [[Hindi]]) name board at the Tirusulam railway station in [[South India]]]]
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Widespread multilingualism is one form of [[language contact]]. Multilingualism was more common in the past than is usually supposed{{Weasel-inline|date=March 2009}}: in early times, when most people were members of small language communities, it was necessary to know two or more languages for trade or any other dealings outside one's own town or village, and this holds good today in places of high linguistic diversity such as [[Sub-Saharan Africa]] and [[India]]. Linguist Ekkehard Wolff estimates that 50% of the population of Africa is multilingual.<ref>Wolff, Ekkehard (2000).  Language and Society. In: Bernd Heine and Derek Nurse (Eds.) ''African Languages - An Introduction'', 317. Cambridge University Press.
</ref>

In multilingual societies, not all speakers need to be multilingual. Some states can have multilingual policies and recognise several official languages, such as Canada (English and French). In some states, particular languages may be associated with particular regions in the state (e.g., Canada) or with particular ethnicities (Singapore). When all speakers are multilingual, linguists classify the community according to the functional distribution of the languages involved:
* '''[[diglossia]]''': if there is a structural functional distribution of the languages involved, the society is termed 'diglossic'. Typical diglossic areas are those areas in [[Europe]] where a [[regional language]] is used in informal, usually oral, contexts, while the state language is used in more formal situations.  [[Frisia]] (with [[Frisian languages|Frisian]] and [[German language|German]] or [[Dutch language|Dutch]]) and [[Lusatia]] (with [[Sorbian]] and German) are well-known examples. Some writers limit diglossia to situations where the languages are closely related, and could be considered dialects of each other.  This can also be observed in Scotland where in formal situations, [[English language|English]] is used.  However, in informal situations in many areas, [[Scots language|Scots]] is the preferred language of choice.
* '''ambilingualism''': a region is called ambilingual if this functional distribution is not observed. In a typical ambilingual area it is nearly impossible to predict which language will be used in a given setting. True ambilingualism is rare. Ambilingual tendencies can be found in small states with multiple heritages like [[Luxembourg]], which has a combined Franco-Germanic heritage, or [[Singapore]], which fuses the cultures of [[Malaysia]], [[China]], and [[India]].  Ambilingualism also can manifest in specific regions of larger states that have a clearly dominant state language (be it ''de jure'' or ''de facto'') as well a protected minority language that is spoken in a given region.  This tendency is especially pronounced when, even though the local language is widely spoken, there is a reasonable assumption that all citizens speak the predominant state tongue (E.g., English in Canada). This phenomenon can also occur in border regions with many cross-border contacts.
* '''bipart-lingualism''': if more than one language can be heard in a small area, but the large majority of speakers are monolinguals, who have little contact with speakers from neighbouring ethnic groups, an area is called 'bipart-lingual'. The typical{{Weasel-inline|date=March 2009}} example is the [[Balkans]].

==Multilingualism between different language speakers==
Whenever two people meet, negotiations take place. If they want to express solidarity and sympathy, they tend to seek common features in their behavior. If speakers wish to express distance towards or even dislike of the person they are speaking to, the reverse is true, and differences are sought. This mechanism also extends to language, as has been described by [[Howard Giles]]' Accommodation Theory. 

Some multilinguals use [[code-switching]], a term that describes the process of 'swapping' between languages. In many cases, code-switching is motivated by the wish to express loyalty to more than one cultural group{{Fact|date=November 2008}}, as holds for many immigrant communities in the New World. Code-switching may also function as a strategy where proficiency is lacking. Such strategies are common if the vocabulary of one of the languages is not very elaborated for certain fields, or if the speakers have not developed proficiency in certain lexical domains, as in the case of immigrant languages.

This code-switching appears in many forms. If a speaker has a positive attitude towards both languages and towards code-switching, many switches can be found, even within the same sentence<ref>[[Shana Poplack|Poplack, Shana]] (1980) "Sometimes I'll start a sentence in Spanish y termino en español": toward a typology of code-switching. ''Linguistics'' 18: 7/8: 581-618.</ref>. If, however, the speaker is reluctant to use code-switching, as in the case of a lack of proficiency, he might knowingly or unknowingly try to camouflage his attempt by converting elements of one language into elements of the other language. This results in speakers using words like ''courrier noir'' (literally mail that is black) in French, instead of the proper word for [[blackmail]], ''chantage''.

Bilingual interaction can even take place without the speakers switching. In certain areas, it is not uncommon for speakers each to use a different language within the same conversation. This phenomenon is found, amongst other places, in [[Scandinavia]]. Speakers of [[Swedish language|Swedish]] and [[Norwegian language|Norwegian]] can easily communicate with each other speaking their respective languages. It is usually called [[non-convergent discourse]], a term introduced by the [[Netherlands|Dutch]] linguist Reitze Jonkman.  This phenomenon is also found in [[Argentina]], where [[Spanish language|Spanish]] and [[Italian language|Italian]] are both widely spoken, even leading to cases where a child with a Spanish and an Italian parent grows up fully bilingual, with both parents speaking only their own language yet knowing the other. Another example is the former state of [[Czechoslovakia]], where two languages ([[Czech language|Czech]] and [[Slovak language|Slovak]]) were in common use. Most Czechs and Slovaks understand both languages, although they would use only one of them (their respective mother tongue) when speaking. For example, in Czechoslovakia it was common to hear two people talking on television each speaking a different language without any difficulty understanding each other. Another example would be a Slovak having read a book in Czech and afterwards being unsure whether he was reading it in Czech or Slovak. This bilinguality still exists nowadays, although it has started to deteriorate after Czechoslovakia split up {{Fact|date=March 2008}}.

==Multilingualism at the linguistic level==
===Models for native language literacy programs===
Sociopolitical as well as socio-cultural identity arguments may influence native language literacy.  While these two camps may occupy much of the debate about which languages children will learn to read, a greater emphasis on the linguistic aspects of the argument is appropriate.  In spite of the political turmoil precipitated by this debate, researchers continue to espouse a linguistic basis for it.  This rationale is based upon the work of Jim Cummins (1983).<!--- this paragraph is not intelligible --->

===Sequential model===
In this model, learners receive literacy instruction in their native language until they acquire a "threshold" literacy proficiency. Some researchers use age 3 as the age when a child has basic communicative competence in L1 (Kessler, 1984).<ref>[http://www.hanen.org/web/Home/AboutHanen/NewsViews/OneLanguageorTwo/tabid/220/Default.aspx One Language or Two: Answers to Questions about Bilingualism in Language-Delayed Children]</ref> Children may go through a process of sequential acquisition if they migrate at a young age to a country where a different language is spoken, or if the child exclusively speaks his or her heritage language at home until he/she is immersed in a school setting where instruction is offered in a different language.
 
The phases children go through during sequential acquisition are less linear than for simultaneous acquisition and can vary greatly among children. Sequential acquisition is a more complex and lengthier process, although there is no indication that non language-delayed children end up less proficient than simultaneous bilinguals, so long as they receive adequate input in both languages.

===Bilingual model===
In this model, the native language and the community language are simultaneously taught.  The advantage is literacy in two languages as the outcome.  However, the teacher must be well-versed in both languages and also in techniques for teaching a second language.

===Coordinate model===
This model posits that equal time should be spent in separate instruction of the native language and of the community language.  The native language class, however, focuses on basic literacy while the community language class focuses on listening and speaking skills. Being a bilingual does not necessarily mean that one can speak, for example, English and French.

===Outcomes===
Cummins' research concluded that the development of competence in the native language serves as a foundation of proficiency that can be transposed to the second language — the common underlying proficiency hypothesis.  His work sought to overcome the perception propagated in the 1960s that learning two languages made for two competing aims.  The belief was that the two languages were mutually exclusive and that learning a second required unlearning elements and dynamics of the first in order to accommodate the second (Hakuta, 1990).  The evidence for this perspective relied on the fact that some errors in acquiring the second language were related to the rules of the first language (Hakuta, 1990).  How this hypothesis holds under different types of languages such as Romance versus non-Western languages has yet to undergo research.

Another new development that has influenced the linguistic argument for bilingual literacy is the length of time necessary to acquire the second language.  While previously children were believed to have the ability to learn a language within a year, today researchers believe that within and across academic settings, the time span is nearer to five years (Collier, 1992; Ramirez, 1992).

An interesting outcome of studies during the early 1990s however confirmed that students who do successfully complete bilingual instruction perform better academically (Collier, 1992; Ramirez, 1992).  These students exhibit more cognitive elasticity including a better ability to analyse abstract visual patterns.  Students who receive bidirectional bilingual instruction where equal proficiency in both languages is required perform at an even higher level.  Examples of such programs include international and multi-national education schools.

==Multilingualism in computing==
Multilingualisation (or "m17n") of computer systems can be considered part of a continuum between localisation ("L10n") and internationalisation ("i18n"):

* A localised system has been adapted or converted for a particular locale (other than the one it was originally developed for), including the language of the user interface, input, and display, and features such as time/date display and currency; but each instance of the system only supports a single locale.

* Multilingualised software supports multiple languages for display and input simultaneously, but generally has a single user interface language.  Support for other locale features like time, date, number and currency formats may vary as the system tends towards full internationalisation.  Generally a multilingualised system is intended for use in a specific locale, whilst allowing for multilingual content.

* An internationalised system is equipped for use in a range of locales, allowing for the co-existence of several languages and character sets in user interfaces and displays.  In particular, a system may not be considered internationalised in the fullest sense unless the interface language is selectable by the user at runtime.

Translating the user interface is usually part of the [[software localization]] process, which also includes adaptations such as units and date conversion. Many software applications are available in several languages, ranging from a handful (the [[List of languages by number of native speakers|most spoken languages]]) to dozens for the most popular applications (such as [[office suite]]s, [[web browser]]s, etc).  Due to the status of [[English in computing]], software development nearly always uses it (but see also [[Non-English-based programming languages]]), so almost all commercial software is initially available in an English version, and multilingual versions, if any, may be produced as alternative options based on the English original.

===Internet===
{{Main|Global internet usage|l1=Languages on the Internet}}

== See also ==
=== Linguistic aspects ===
*[[Multialphabetism]]
*[[Bimodal Bilingualism in the American Deaf Community]]
*[[Cognitive advantages to bilingualism]]
*[[Diglossia]]
*[[Language attrition]]
*[[Heritage speaker]]
*[[Non-convergent discourse]]
*[[Polyglot]]
*[[Adamic]]

=== Country-level descriptions ===
* [[Languages of Belgium]]
* [[Languages of China]]
* [[Languages of India]]
* [[Languages of Spain]]
* [[Languages in the United States]]
* [[List of multilingual countries and regions]]
* [[Linguistic geography of Switzerland|Languages of Switzerland]]
* [[Languages in the United Kingdom]]
* [[Languages of the Philippines]]
* [[Languages of South Africa]]
* [[Multilingualism in Kenya]]

=== Policies and proposals ===
*[[English-only movement]]
*[[European Commissioner for Multilingualism]]
*[[Language legislation in Belgium]]
*[[Official bilingualism in Canada]]

=== Education ===
*[[EISP]] in Thailand
*[[Multilingual Education]]

=== Other ===
*[[Bilingual sign]]
*[[Linguapax Prize]]
*[[Bilingual name]]
*[[Economics of language]]

== References ==
{{Cleanup-link rot|date=June 2009}}
{{reflist}}

*Bastardas-Boada, Albert (2007). [http://bibliotecavirtualut.suagm.edu/Glossa/Journal/jun2007/Linguistic%20Sustainability%20for%20a%20Multilingual%20Humanity.pdf "Linguistic sustainability for a multilingual humanity"], Glossa. An Interdisciplinary Journal, vol. 2, n. 2.
*Bhatia, Tej K. and Ritchie, William C. (2006). ''Handbook of Bilingualism''. Oxford: Blackwell Publishing.
* Burck, C. (2005) Multilingual Living. Explorations of Language and Subjectivity. Hampshire: Palgrave Macmillan.
*Collier, V.P. (1992).  [http://www.ncela.gwu.edu/pubs/nabe/brj/v16/16_12_collier.htm A synthesis of studies examining long-term language-minority student data on academic achievement.]  ''Bilingual Research Journal'', vol. 16, 187-212.
*De Bot, K and Kroll, J.K (2002). 'Psycholinguistics'. In N. Schmitt (Ed.) ''Applied Linguistics''. Oxford University Press: London.
*Gillespie, M. K. (1993).  Profiles of Adult Learners: Revealing the Multiple Faces of Literacy.  ''Tesol Quarterly'', 27(3), Fall 529-533.
*Hakuta, K. (1990).  Bilingualism and bilingual education: A research perspective. Occasional Papers in Bilingual Education.  Washington, DC: Delta Systems & the Center for Applied Linguistics.
*Ramirez, J.D. (1992).  [http://www.ncela.gwu.edu/pubs/nabe/brj/v16/16_12_ramirez.htm Executive summary of the Final Report: Longitudinal study of  structured English immersion strategy, early-exit and late-exit transitional bilingual education programs for language minority children.]  ''Bilingual Research Journal'', vol. 16, 1-62.
*Baetens Beardsmore, H. (1974). Development of the compound-coordinate distinction in bilingualism. ''Lingua, 33'', 123-127.
*Garland, Stanley (2007).  The Bilingual Spectrum.  Guirnalda Publishing, Orlando, Fla., 47-8

== बाह्य दुवे ==
*{{PDFlink|[http://www.literacyonline.org/products/ncal/pdf/TR9403.pdf Adult Literacy]|82.6&nbsp;[[Kibibyte|KiB]]<!-- application/pdf, 84643 bytes -->}}
*[http://www.peques.co.uk/parents/faq.php Common Questions about a bilingual education for young children]
*[http://www.biculturalfamily.org/benefitsofmultilingualism.html The benefits of multilingualism]
*[http://archives.cbc.ca/IDD-1-73-655/politics_economy/bilingualism/ CBC Digital Archives – The Road to Bilingualism]
*[http://www.bilingualwiki.com Encouraging Childhood Multilingualism]
*[http://homepage.ntlworld.com/vivian.c/SLA/SLABIB/ SLABIB: Second Language Acquisition]
*[http://www.hanen.org/web/Home/AboutHanen/NewsViews/OneLanguageorTwo/tabid/220/Default.aspx One Language or Two: Answers to Questions about Bilingualism in Language-Delayed Children]
*[http://www.raising-bilingual-children.com raising-bilingual-children.com - webpage dedicated to educating children in a multilingual environment. Information/Recommendations, Forums, Links etc.]
*[http://www.bilingualism.bangor.ac.uk/ ESRC Centre for Research on Bilingualism in Theory and Practice]
* [http://www.ok-board.com Multilingial virtual keyboard]
* Bastardas-Boada, Albert. [http://www6.gencat.net/llengcat/noves/hm02estiu/metodologia/a_bastardas.pdf"World language policy in the era of globalization: Diversity and intercommunication from the perspective of 'complexity'"], Noves SL. Revista de Sociolingüística 2002 (Summer).
* De Mauro, Tullio "Linguistic Variety and Linguistic Minorities." Italian Cultural Studies, an Introduction. Ed. David Forgacs and Robert Lumley. New York: Oxford UP, 1996. 88-101.
* Full version in English of the Plurilingualism Promotion Plan {{PDFlink|[http://www.juntadeandalucia.es/averroes/plurilinguismo/planing.pdf]|497&nbsp;[[Kibibyte|KiB]]<!-- application/pdf, 509858 bytes -->}}

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[[वर्ग:Multilingualism| ]]

[[ay:Pä arut yatintaña]]
[[be:Білінгвізм]]
[[be-x-old:Шматмоўе]]
[[bg:Многоезичност]]
[[br:Divyezhegezh]]
[[ca:Bilingüisme]]
[[cs:Bilingvismus]]
[[cy:Dwyieithrwydd]]
[[da:Tosproget]]
[[de:Bilingualismus]]
[[el:Δίγλωσσος]]
[[es:Bilingüismo]]
[[et:Kakskeelsus]]
[[eu:Elebitasun]]
[[fi:Kaksikielisyys]]
[[fr:Bilinguisme]]
[[frr:Touspräkihäid (aptiien)]]
[[gd:Dà-chànanas]]
[[gl:Bilingüismo]]
[[he:רב-לשוניות]]
[[hi:बहुभाषिकता]]
[[id:Bilingual]]
[[it:Bilinguismo]]
[[kk:Билингвизм]]
[[ko:다중언어]]
[[ky:Билингвизм]]
[[lb:Bilingualismus]]
[[lt:Dvikalbystė]]
[[lv:Bilingvālisms]]
[[nn:Fleirspråkleg]]
[[no:Flerspråklighet]]
[[pl:Dwujęzyczność]]
[[pt:Bilinguismo]]
[[ru:Билингвизм]]
[[sr:Двојезичност]]
[[ti:ድርብ ቋንቋነት]]
[[uk:Двомовність]]