A 'dialect continuum' is a range of
dialects spoken across a large geographical area, differing only slightly between areas that are geographically close, and gradually decreasing in
mutual intelligibility as the distances become greater. Dialects separated by great geographical distances may not be mutually comprehensible. According to the
Ausbausprache - Abstandsprache - Dachsprache paradigm, these dialects can be considered Abstandsprachen (i.e., as stand-alone languages). However, they can be seen as dialects of a single language, provided that a common
standard language, through which communication is possible, exists.
In
sociolinguistics, a 'language continuum' is said to exist when two or more different
languages or
dialects merge one into the other(s) without a definable boundary.
Scandinavian languages
The
Germanic languages and dialects of Scandinavia are a classical example of a dialect contiuum, from Swedish dialects of
Finland, to
Swedish,
Gutniska,
Älvdalsmål,
Scanian,
Danish,
Norwegian (
Bokmål and
Nynorsk),
Faroese,
Icelandic, as well as many local dialects of the respective languages. The Continental Scandinavian languages (Swedish, Danish, and Norwegian) are close enough and intelligible enough that some consider them to be dialects of the same language, whereas the Insular ones (Icelandic and Faroese) are unintelligible to the other Scandinavian speakers. Some, however, would argue that Swedish and the southern dialect of Scanian are far apart enough to be considered different languages, assuming that the other Scandinavian languages are also separate languages and not dialects.
Continental West Germanic
The many dialects making up
German,
Dutch,
Afrikaans,
Low German and
Yiddish are often cited as another canonical example. They form a single dialect continuum, with three recognized
literary standards. Although Dutch and standard German are not mutually intelligible, there are transitional dialects that are, for example
Limburgish, spoken in parts of the
Netherlands and
Belgium, and the
Low Franconian dialects across the border in
Germany (although Limburgish is nowadays sometimes considered a language in its own right).
Another example was the area where the river
Rhine crosses the border from
Germany to the
Netherlands. On both sides of this border, the people living in the immediate surroundings spoke an identical language. They could understand each other without difficulty, and would even have had trouble telling just by the language whether a person from the region was from the Netherlands or from Germany. However, the Germans here called their language "German", and the Dutch called their language "Dutch", so in sociolinguistic terms they were speaking different
languages.
Slavic languages
Another such network of dialects is the continuum of the
Eastern Slavic languages, among which
Russian,
Belarusian, and
Ukrainian are recognized as three literary standards. The
Serbo-Croatian language can also be viewed as a network of four major dialects and three literary standards.
Romance languages
The
Italo-Western branch of the
Romance languages, which comprises
Italian,
Occitan,
Spanish,
Catalan,
French,
Sardinian and
Portuguese, as well as other languages with fewer speakers, is sometimes presented as another example, although the major languages in this group have had separate
standards for longer than the languages in the continental West Germanic group, and are not commonly classified as
dialects of a common language. In recent centuries, the intermediate dialects which existed between the major Romance languages have been moving toward
extinction, as their speakers have switched to varieties closer to the more prestigious national standards. This process has been most notable in France, due to the French government's refusal to recognise minority languages, but has occurred to some extent in all Western Romance speaking countries. Language change has also threatened the survival of stateless languages with existing literary standards, such as Occitan and Catalan.
A less arguable example of a dialect continuum within the Italo-Western languages are the Romance
languages of Italy. For many decades since its unification, the above attitude of the French government was reflected in
Rome by the Italian government which affected the adjoining dialects of this continuum spoken in Northern Italy. These include
Venetian and
Piedmontese among others. Over the years however, under pressure from the
Northern League, the Italian government has yielded in allowing public signs and other media to use both local and national standard dialects in most affected areas.
The eastern branch of the Romance languages is dominated by the dialects collectively classed as
Romanian. Outside of
Romania's present borders, these dialects continue to form the neighbouring
Moldovan language language of Moldova. To the west and south of Romania these dialects continue into
Bulgaria,
Macedonia and
Serbia though with distance from their heaviest concentration (the two named countries), the population becomes more sparse as each generation decreases in number due to assimilation of the local languages. Romanian language communities are found farther afield in
Greece and
Albania too, but perhaps the most endangered is in
Istria in
Croatia. It is interesting to reflect that this particular dialect known as
Istro-Romanian is thought by many to be the closest surviving language to the extinct
Dalmatian. Dalmatian in turn formed a chain with Venetian, which led to Italian etc, and so a single continuum may have been spoken had Dalmatian still been used.
Arabic
Arabic is a classic case of
diglossia. The standard written language,
Modern Standard Arabic, is based on the
Classical Arabic of the
Qur'an, while the
modern vernacular dialects (or languages)—which form a dialect continuum reaching from the
Maghreb in North Western
Africa through
Egypt,
Sudan, and the
Fertile Crescent to the
Arabian Peninsula—have diverged widely from that. Because Arabic is written in an
Abjad (a writing system unlike an alphabet), the difference between the written standard and the vernaculars also becomes apparent in the written language and so children have to be taught Modern Standard Arabic in school in order to be able to write it.
Chinese
The
spoken variants of Chinese are highly divergent, forming a continuum comparable to that of the Romance languages. However, all the variants more or less share a common
written language, though there are vernacular variations in vocabulary and grammar, and also even in the characters.
The written language originally shared by all dialects was
Classical Chinese, which was in normal use up until the early 20th century. In pre-modern times, Northern
Baihua grew up alongside Classical Chinese as a standard vernacular dialect. The modern standard dialect,
Putonghua (often called Mandarin), is largely based on Baihua.
Within the dialects, gradations do exist between pure local vernacular and the more refined speech of the better educated that incorporates elements from the standard language or written language.
Of course, the development of the divergent Chinese languages was made much easier because the characters used for writing Chinese are not tied closely to pronunciation as alphabetic or syllabic scripts are. In other words, a
Cantonese speaker may write his language much the same as a
Mandarin speaker and yet pronounce the written text totally differently.
Northern India
The languages spoken in
Northern India form a dialect continuum. What is called "
Hindi" in India is actually Standardized Hindi, the
Sanskrit-ized version of the colloquial "
Hindustani" spoken in the
Delhi area during the time of the
Mughals. However, the term Hindi can be used to enclose all its dialects from east to west—from
Bihar to
Rajasthan. The
Indo-Aryan prakrits also gave rise to languages like
Gujarati,
Bengali,
Oriya,
Marathi and
Punjabi. Of these, Punjabi can probably be included in the northern Indian continuum. Gujarati is also in some ways close to the dialects of Hindi spoken in the southern Rajasthan region.
Iran and Central Asia
The Persian language in its various forms - Farsi (Iran), Dari (Afghanistan) and Tajik (Tajikistan) - is representative of a dialect continuum. Although official forms of the language vary less from one another, spoken Tajik would be virtually incomprehensible to a Farsi-speaker from the Persian Gulf coast, and vice versa. The divergence of Tajik was accelerated by the shift from the Perso-Arabic alphabet to a Cyrillic one under the Soviets. Western dialects of Farsi show greater influence from Arabic and Oghuz Turkic languages, while Dari and Tajik tend to preserve many classical features in grammar and vocabulary.
Africa
There are many examples of dialect continua among the
languages of Africa, particularly
south of the Sahara.
See also
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Dialect levelling
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Dialectometry
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Diasystem
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Diglossia
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Ausbausprache - Abstandsprache - Dachsprache
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Post-creole speech continuum
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Mutual intelligibility