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In linguistic typology, polysynthetic languages, formerly holophrastic languages, are highly synthetic languages, i.e. languages in which words are composed of many
morpheme A morpheme is the smallest meaningful Constituent (linguistics), constituent of a linguistic expression. The field of linguistics, linguistic study dedicated to morphemes is called morphology (linguistics), morphology. In English, morphemes are ...
s (word parts that have independent meaning but may or may not be able to stand alone). They are very highly
inflected In linguistic morphology, inflection (or inflexion) is a process of word formation in which a word is modified to express different grammatical categories such as tense, case, voice, aspect, person, number, gender, mood, animacy, and de ...
languages. Polysynthetic languages typically have long "sentence-words" such as the Yupik word . Except for the morpheme "reindeer", none of the other morphemes can appear in isolation. Whereas isolating languages have a low morpheme-to-word ratio, polysynthetic languages have a very high ratio. There is no generally agreed upon definition of polysynthesis. Generally polysynthetic languages have polypersonal agreement, although some
agglutinative In linguistics, agglutination is a morphological process in which words are formed by stringing together morphemes, each of which corresponds to a single syntactic feature. Languages that use agglutination widely are called agglutinative l ...
languages that are not polysynthetic also have it, such as Basque, Hungarian and Georgian. Some authors apply the term polysynthetic to languages with high morpheme-to-word ratios, but others use it for languages that are highly head-marking, or those that frequently use noun incorporation. Polysynthetic languages can be
agglutinative In linguistics, agglutination is a morphological process in which words are formed by stringing together morphemes, each of which corresponds to a single syntactic feature. Languages that use agglutination widely are called agglutinative l ...
or fusional depending on whether they encode one or multiple grammatical categories per affix. At the same time, the question of whether to call a particular language polysynthetic is complicated by the fact that morpheme and word boundaries are not always clear cut, and languages may be highly synthetic in one area but less synthetic in other areas (e.g., verbs and nouns in Southern Athabaskan languages or
Inuit languages The Inuit languages are a closely related group of indigenous American languages traditionally spoken across the North American Arctic and adjacent subarctic, reaching farthest south in Labrador. The related Yupik languages (spoken in weste ...
). Many polysynthetic languages display complex evidentiality and/or mirativity systems in their verbs. The term was invented by Peter Stephen Du Ponceau, who considered polysynthesis, as characterized by sentence words and noun incorporation, a defining feature of all
indigenous languages of the Americas Over a thousand indigenous languages are spoken by the Indigenous peoples of the Americas. These languages cannot all be demonstrated to be related to each other and are classified into a hundred or so language families (including a large nu ...
. This characterization was shown to be wrong, since many indigenous American languages are not polysynthetic, but it is a fact that polysynthetic languages are not evenly distributed throughout the world, but more frequent in the
Americas The Americas, which are sometimes collectively called America, are a landmass comprising the totality of North America, North and South America. The Americas make up most of the land in Earth's Western Hemisphere and comprise the New World. ...
,
Australia Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. With an area of , Australia is the largest country by ...
, Siberia, and
New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; id, Papua, or , historically ) is the world's second-largest island with an area of . Located in Oceania in the southwestern Pacific Ocean, the island is separated from Australia by the wide Torres ...
; however, there are also examples in other areas. The concept became part of linguistic typology with the work of Edward Sapir, who used it as one of his basic typological categories. Recently, Mark C. Baker has suggested formally defining polysynthesis as a macro-parameter within
Noam Chomsky Avram Noam Chomsky (born December 7, 1928) is an American public intellectual: a linguist, philosopher, cognitive scientist, historian, social critic, and political activist. Sometimes called "the father of modern linguistics", Chomsky i ...
's principles and parameters theory of grammar. Other linguists question the basic utility of the concept for typology since it covers many separate morphological types that have little else in common.


Meaning

The word "polysynthesis" is composed of the Greek roots ''poly'' meaning "many" and ''synthesis'' meaning "placing together". In linguistics a word is defined as a unit of meaning that can stand alone in a sentence, and which can be uttered in isolation. Words may be simple, consisting of a single unit of meaning, or they can be complex, formed by combining many small units of meaning, called
morpheme A morpheme is the smallest meaningful Constituent (linguistics), constituent of a linguistic expression. The field of linguistics, linguistic study dedicated to morphemes is called morphology (linguistics), morphology. In English, morphemes are ...
s. In a general non-theoretical sense polysynthetic languages are those languages that have a high degree of morphological synthesis, and which tend to form long complex words containing long strings of
morpheme A morpheme is the smallest meaningful Constituent (linguistics), constituent of a linguistic expression. The field of linguistics, linguistic study dedicated to morphemes is called morphology (linguistics), morphology. In English, morphemes are ...
s, including derivational and inflectional morphemes. A language then is "synthetic" or "synthesizing" if it tends to have more than one morpheme per word, and a polysynthetic language is a language that has "many" morphemes per word. The concept was originally used only to describe those languages that can form long words that correspond to an entire sentence in English or other
Indo-European languages The Indo-European languages are a language family native to the overwhelming majority of Europe, the Iranian plateau, and the northern Indian subcontinent. Some European languages of this family, English, French, Portuguese, Russian, D ...
, and the word is still most frequently used to refer to such "sentence words". Often polysynthesis is achieved when languages have extensive
agreement Agreement may refer to: Agreements between people and organizations * Gentlemen's agreement, not enforceable by law * Trade agreement, between countries * Consensus, a decision-making process * Contract, enforceable in a court of law ** Meeting ...
between elements verbs and their arguments so that the verb is marked for agreement with the grammatical subject and object. In this way a single word can encode information about all the elements in a transitive clause. In Indo-European languages the verb is usually only marked for agreement with the subject (e.g. Spanish ' "I speak" where the -o ending marks agreement with the first person singular subject), but in many languages verbs also agree with the object (e.g. the Kiswahili word ' "I love you" where the ' prefix marks agreement with the first person singular subject and the ' prefix marks agreement with a second person singular object). Many polysynthetic languages combine these two strategies, and also have ways of inflecting verbs for concepts normally encoded by adverbs or adjectives in Indo-European languages. In this way highly complex words can be formed, for example the Yupik word ' which means "He had not yet said again that he was going to hunt reindeer." The word consists of the morphemes ' with the meanings, reindeer-hunt-future-say-negation-again-third.person.singular.indicative, and except for the morpheme ' "reindeer", none of the other morphemes can appear in isolation. Another way to achieve a high degree of synthesis is when languages can form compound words by incorporation of nouns, so that entire words can be incorporated into the verb word, as ''baby'' is incorporated in the English verb ''babysit''. Another common feature of polysynthetic languages is a tendency to use
head marking A language is head-marking if the grammatical marks showing agreement between different words of a phrase tend to be placed on the heads (or nuclei) of phrases, rather than on the modifiers or dependents. Many languages employ both head-marking ...
as a means of syntactic cohesion. This means that many polysynthetic languages mark grammatical relations between verbs and their constituents by indexing the constituents on the verb with agreement morphemes, and the relation between noun phrases and their constituents by marking the head noun with agreement morphemes. There are some dependent-marking languages that may be considered to be polysynthetic because they use case stacking to achieve similar effects, and very long words.


Examples

An example from Chukchi, a polysynthetic, incorporating, and agglutinating language of Russia which also has
grammatical case A grammatical case is a category of nouns and noun modifiers ( determiners, adjectives, participles, and numerals), which corresponds to one or more potential grammatical functions for a nominal group in a wording. In various languages, nomin ...
s unlike the majority of incorporating polysynthetic languages: From Classical Ainu of Japan, another polysynthetic, incorporating, and agglutinating language: The Mexican language Nahuatl is also considered to be polysynthetic, incorporating and agglutinating. The following
verb A verb () is a word ( part of speech) that in syntax generally conveys an action (''bring'', ''read'', ''walk'', ''run'', ''learn''), an occurrence (''happen'', ''become''), or a state of being (''be'', ''exist'', ''stand''). In the usual descr ...
shows how the verb is marked for subject,
patient A patient is any recipient of health care services that are performed by healthcare professionals. The patient is most often ill or injured and in need of treatment by a physician, nurse, optometrist, dentist, veterinarian, or other heal ...
,
object Object may refer to: General meanings * Object (philosophy), a thing, being, or concept ** Object (abstract), an object which does not exist at any particular time or place ** Physical object, an identifiable collection of matter * Goal, an ...
, and indirect object: The Australian language Tiwi is also considered highly polysynthetic: And the Iroquoian language Mohawk: An example from Western Greenlandic, an exclusively suffixing polysynthetic language:


History of the concept


Peter Stephen Du Ponceau on Native American languages

The term "polysynthesis" was first used by Peter Stephen DuPonceau (a.k.a. Pierre Étienne Du Ponceau) in 1819 as a term to describe the structural characteristics of American languages: The term was made popular in a posthumously published work by Wilhelm von Humboldt (1836), and it was long considered that all the indigenous languages of the Americas were of the same type. Humboldt considered language structure to be an expression of the psychological stage of evolution of a people, and since Native Americans were considered uncivilized, polysynthesis came to be seen as the lowest stage of grammatical evolution, characterized by a lack of rigorous rules and clear organization known in European languages. Duponceau himself had argued that the complex polysynthetic nature of American languages was a relic of a more civilized past, and that this suggested that the Indians of his time had degenerated from a previous advanced stage. Duponceau's colleague Albert Gallatin contradicted this theory, arguing rather that synthesis was a sign of a lower cultural level, and that while the Greek and Latin languages were somewhat synthetic, Native American languages were much more so – and consequently polysynthesis was the hallmark of the lowest level of intellectual evolution. This view was still prevalent when linguist William Dwight Whitney wrote in 1875. He considered polysynthesis to be a general characteristic of American languages, but he did qualify the statement by mentioning that certain languages such as Otomi and the Tupi-Guarani languages had been claimed to be basically analytic.


D. G. Brinton

The ethnologist Daniel Garrison Brinton, the first professor of anthropology in the US, followed Duponceau, Gallatin and Humboldt in seeing polysynthesis, which he distinguished from incorporation, as a defining feature of all the languages of the Americas. He defined polysynthesis in this way: In the 1890s the question of whether polysynthesis could be considered a general characteristic of Native American languages became a hotly contested issue as Brinton debated the question with John Hewitt. Brinton, who had never done fieldwork with any indigenous group continued to defend Humboldt and Duponceau's view of the exceptional nature of American languages against the claim of Hewitt, who was half
Tuscarora Tuscarora may refer to the following: First nations and Native American people and culture * Tuscarora people **'' Federal Power Commission v. Tuscarora Indian Nation'' (1960) * Tuscarora language, an Iroquoian language of the Tuscarora people * ...
and had studied the Iroquoian languages, that languages such as the Iroquois had grammatical rules and verbs just like European languages.


Edward Sapir's morphological types

Edward Sapir reacted to the prevailing view in Americanist linguistics which considered the languages of the Americas to belong to a single basic polysynthetic type, arguing instead that American indigenous languages were highly diverse and encompassed all known morphological types. He also built on the work of
Leonard Bloomfield Leonard Bloomfield (April 1, 1887 – April 18, 1949) was an American linguist who led the development of structural linguistics in the United States during the 1930s and the 1940s. He is considered to be the father of American distributionalis ...
who in his 1914 work "language" dismissed morphological typology, stating specifically that the term polysynthetic had never been clearly defined. In Sapir's 1921 book also titled "Language", he argued that instead of using the morphological types as a strict classification scheme it made more sense to classify languages as relatively more or less synthetic or analytic, with the isolating and polysynthetic languages in each of the extremes of that spectrum. He also argued that languages were rarely purely of one morphological type, but used different morphological strategies in different parts of the grammar. Sapir introduced a number of other distinctions according to which languages could be morphologically classified, and proposed combining them to form more complex classifications. He proposed classifying languages both by the degree of synthesis, classifying languages as either analytic, synthetic or polysynthetic, and by the technique used to achieve synthesis, classifying languages as agglutinative, fusional, or symbolic. Among the examples of polysynthetic languages he gave was
Haida Haida may refer to: Places * Haida, an old name for Nový Bor * Haida Gwaii, meaning "Islands of the People", formerly called the Queen Charlotte Islands * Haida Islands, a different archipelago near Bella Bella, British Columbia Ships * , a ...
which he considered to use the agglutinative-isolating technique, Yana and Nootka both of which he considered agglutinative, Chinook and Algonkin which he considered fusional. The Siouan languages he considered "mildly polysynthetic" and agglutinative-fusional. Following Sapir's understanding of Polysynthesis, his student Benjamin Lee Whorf proposed a distinction between oligosynthetic and polysynthetic languages, where the former term was applied to languages with a very small number of morphemes of which all other lexical units are composed. No language has been shown to fit the description of an oligosynthetic language and the concept is not in general use in linguistics.


Contemporary approaches


Generative approaches

The sentence structure of polysynthetic languages has been taken as a challenge for linguists working within
Noam Chomsky Avram Noam Chomsky (born December 7, 1928) is an American public intellectual: a linguist, philosopher, cognitive scientist, historian, social critic, and political activist. Sometimes called "the father of modern linguistics", Chomsky i ...
's
generative Generative may refer to: * Generative actor, a person who instigates social change * Generative art, art that has been created using an autonomous system that is frequently, but not necessarily, implemented using a computer * Generative music, mus ...
theoretical framework that operates with the assumption that all the world's languages share a set of basic syntactic principles.


Non-configurationality and the pronominal argument hypothesis

Eloise Jelinek Eloise Jelinek (February 2, 1924 in Dallas – December 21, 2007 in Tucson) was an American linguist specializing in the study of syntax. Her 1981 doctoral dissertation at the University of Arizona was titled "On Defining Categories: AUX and PRED ...
, having worked with Salishan and
Athabascan languages Athabaskan (also spelled ''Athabascan'', ''Athapaskan'' or ''Athapascan'', and also known as Dene) is a large family of indigenous languages of North America, located in western North America in three areal language groups: Northern, Pacific ...
, proposed an analysis of polysynthetic languages in which the morphemes that agree with the arguments of the verb are not just considered indexes of the arguments, but in fact constitute the primary expression of the arguments within the sentence. Because this theory posits that the pronominal agreement morphemes are the true syntactic arguments of the sentence, Jelinek's hypothesis was called the pronominal argument hypothesis. If the hypothesis were correct, it would mean that free standing nouns in such languages did not constitute syntactical arguments, but simply adjoined specifiers or adjuncts. This in turn explained why many polysynthetic languages seem to be non-configurational, i.e. they have no strict rules for word order and seemingly violate many of the basic rules for syntactic structures posited within the generative framework.


Mark C. Baker's polysynthesis parameter

In 1996 Mark C. Baker proposed a definition of polysynthesis as a syntactic macroparameter within
Noam Chomsky Avram Noam Chomsky (born December 7, 1928) is an American public intellectual: a linguist, philosopher, cognitive scientist, historian, social critic, and political activist. Sometimes called "the father of modern linguistics", Chomsky i ...
's " principles and parameters" program. He defines polysynthetic languages as languages that conform to the syntactic rule that he calls the "polysynthesis parameter", and that as a result show a special set of morphological and syntactic properties. The polysynthesis parameter states that all phrasal heads must be marked with either agreement morphemes of their direct argument or else incorporate these arguments in that head. This definition of polysynthesis leaves out some languages that are commonly stated as examples of polysynthetic languages (such as Inuktitut), but can be seen as the reason for certain common structural properties in others, such as Mohawk and Nahuatl. Baker's definition, probably because of its heavy dependence on generative theory, has not been accepted as a general definition of polysynthesis.


Johanna Mattissen's affixal and compositional subtypes

Johanna Mattissen suggests that polysynthetic languages can be fundamentally divided into two typological categories, which differ in the way morphemes are organised to form words. She calls the two types for affixal and compositional polysynthesis respectively.


Affixal

Affixally polysynthetic languages, as the name suggests, are those that use only non-root- bound morphemes to express concepts that in less synthetic languages are expressed by separate words such as
adjective In linguistics, an adjective ( abbreviated ) is a word that generally modifies a noun or noun phrase or describes its referent. Its semantic role is to change information given by the noun. Traditionally, adjectives were considered one of the ...
s and
adverb An adverb is a word or an expression that generally modifies a verb, adjective, another adverb, determiner, clause, preposition, or sentence. Adverbs typically express manner, place, time, frequency, degree, level of certainty, etc., answering ...
s. They also use these bound morphemes to make other
noun A noun () is a word that generally functions as the name of a specific object or set of objects, such as living creatures, places, actions, qualities, states of existence, or ideas.Example nouns for: * Living creatures (including people, alive, ...
s and
verb A verb () is a word ( part of speech) that in syntax generally conveys an action (''bring'', ''read'', ''walk'', ''run'', ''learn''), an occurrence (''happen'', ''become''), or a state of being (''be'', ''exist'', ''stand''). In the usual descr ...
s from a basic root, which can lead to very complex word forms without non-lexical suffixes. These bound morphemes often relate to body parts, other essential items of the culture of the language's speakers or features of the landscape where the language is spoken. Deictics and other spatial and temporal relations are also very common among these bound morphemes in affixally polysynthetic languages. Affixally polysynthetic languages do not use noun incorporation or verb serialisation, since this violates the rule concerning the number of roots allowable per word. Many make a weak distinction between nouns and verbs, which allows using affixes to translate these parts of speech. Affixally polysynthetic languages may have a word structure that is either * templatic, with a fixed number of slots for different elements, which are fixed in their position and order relative to each other; or * scope ordered, with forms not restricted in complexity and length. The components are fixed in their relative ''scope'' and are thus ordered according to the intended meaning. Usually in this case a few components ''are'' actually fixed, such as the root in Eskimo–Aleut languages. Examples of affixally polysynthetic languages include Inuktitut,
Cherokee The Cherokee (; chr, ᎠᏂᏴᏫᏯᎢ, translit=Aniyvwiyaʔi or Anigiduwagi, or chr, ᏣᎳᎩ, links=no, translit=Tsalagi) are one of the indigenous peoples of the Southeastern Woodlands of the United States. Prior to the 18th century, th ...
,
Athabaskan languages Athabaskan (also spelled ''Athabascan'', ''Athapaskan'' or ''Athapascan'', and also known as Dene) is a large family of indigenous languages of North America, located in western North America in three areal language groups: Northern, Pacific C ...
, the
Chimakuan languages The Chimakuan languages are a group of extinct languages that were spoken in northwestern Washington state, United States, on the Olympic Peninsula. They were spoken by Chimakum, Quileute and Hoh tribes. They are part of the Mosan sprachbund, ...
( Quileute) and the Wakashan languages.


Compositional

In compositionally polysynthetic languages, there usually can be more than one free morpheme per word, which gives rise to noun incorporation and verb serialisation to create extremely long words. Bound affixes, though less important in compositionally polysynthetic languages than in affixally polysynthetic languages, tend to be equally abundant in both types. It is believed that all affixally polysynthetic languages evolved from compositionally polysynthetic ones via the conversion of morphemes that could stand on their own into affixes. Because they possess a greater number of free morphemes, compositionally polysynthetic languages are much more prone than affixally polysynthetic ones to evolve into simpler languages with less complex words. On the other hand, they are generally easier to distinguish from non-polysynthetic languages than affixally polysynthetic languages. Examples of compositionally polysynthetic languages include Classical Ainu , Sora, Chukchi, Tonkawa, and most Amazonian languages.


Distribution


Eurasia

*
Chukotko-Kamchatkan languages The Chukotko-Kamchatkan or Chukchi–Kamchatkan languages are a language family of extreme northeastern Siberia. Its speakers traditionally were indigenous hunter-gatherers and reindeer-herders. Chukotko-Kamchatkan is endangered. The Kamchatka ...
*
Ket Kentucky Educational Television (KET) is a state network of PBS member television stations serving the U.S. Commonwealth of Kentucky. It is operated by the Kentucky Authority for Educational Television, an agency of the Kentucky state governme ...
(possible) * Nivkh (possible) * Ainu * Jiarongic languages *
Munda languages The Munda languages are a group of closely related languages spoken by about nine million people in India and Bangladesh. Historically, they have been called the Kolarian languages. They constitute a branch of the Austroasiatic language family ...
* Northwest Caucasian languages


North America

*
Algonquian languages The Algonquian languages ( or ; also Algonkian) are a subfamily of indigenous American languages that include most languages in the Algic language family. The name of the Algonquian language family is distinguished from the orthographically simi ...
* Caddoan languages * Eskimo–Aleut languages *
Iroquoian languages The Iroquoian languages are a language family of indigenous peoples of North America. They are known for their general lack of labial consonants. The Iroquoian languages are polysynthetic and head-marking. As of 2020, all surviving Iroquoian ...
*
Na-Dene languages Na-Dene (; also Nadene, Na-Dené, Athabaskan–Eyak–Tlingit, Tlina–Dene) is a family of Native American languages that includes at least the Athabaskan languages, Eyak, and Tlingit languages. Haida was formerly included, but is now consider ...
*
Salishan languages The Salishan (also Salish) languages are a family of languages of the Pacific Northwest in North America (the Canadian province of British Columbia and the American states of Washington, Oregon, Idaho and Montana). They are characterised by a ...
* Siouan languages * Uto-Aztecan languages * Wakashan languages * Yana/ Yahi and other Hokan languages


Mesoamerica

* Mayan languages *
Totonacan languages The Totonacan languages (also known as Totonac–Tepehua languages) are a family of closely related languages spoken by approximately 290,000 Totonac (approx. 280,000) and Tepehua (approx. 10,000) people in the states of Veracruz, Puebla, and ...
* Mixe-Zoquean languages * Purépecha language * Tequistlatecan languages * Huave language


South America

* Chibchan languages * Aymaran languages * Quechuan languages * Tupi–Guaraní languages *
Arawakan languages Arawakan (''Arahuacan, Maipuran Arawakan, "mainstream" Arawakan, Arawakan proper''), also known as Maipurean (also ''Maipuran, Maipureano, Maipúre''), is a language family that developed among ancient indigenous peoples in South America. Branc ...
* Many Amazonian languages * Mapudungun


Oceania

* many Papuan languages (e.g. Awtuw, Yimas) * northern
Australian languages The Indigenous languages of Australia number in the hundreds, the precise number being quite uncertain, although there is a range of estimates from a minimum of around 250 (using the technical definition of 'language' as non-mutually intellig ...
(e.g. Macro-Gunwinyguan, Murrinh-patha, classical Tiwi, Enindhilyagwa)


Notes


References


Citations


Works

* Pentland, David H. (2006). "Algonquian and Ritwan Languages", in Keith Brown, ed., ''Encyclopedia of Languages and Linguistics'' (2nd ed.), pp. 161–6. Amsterdam: Elsevier. * Baker, Mark. (1988). ''Incorporation: A theory of grammatical function changing''. * * * * Boas, Franz. (1911). ''Handbook of American Indian languages'' (Part 1). * * * * * * Comrie, Bernard. (1989). ''Language universals and linguistic typology'' (2nd ed.). Chicago: The University of Chicago Press. * * * Fortescue, Michael. (1983). ''A comparative manual of affixes for the Inuit dialects of Greenland, Canada, and Alaska''. Meddelelser om Grønland, Man & society (No. 4). Copenhagen: Nyt Nordisk Forlag. * Fortescue, Michael. (1994). Morphology, polysynthetic. In R. E. Asher & J. M. Y. Simpson (Eds.), ''The Encyclopedia of language and linguistics''. * * * Hewitt, John N. B. (1893). Polysynthesis in the languages of the American Indians. ''American Anthropologist'', ''6'', 381–407. * von Humboldt, Wilhelm. (1836). ''Über die Verschiedenheit des menschichen Sprachbaues und ihren Einfluß auf die geistige Entwicklung des Menschengeschlechts''. Berlin: Königliche Akadamie der Wissenschaften. * Jacobson, Steven A. (1977). ''A grammatical sketch of Siberian Yupik Eskimo'' (pp. 2–3). Fairbanks: Alaska Native Languages Center, University of Alaska. * * * *Mithun, Marianne. 1983
The genius of polysynthesis
North American Indians: Humanistic Perspectives. James S. Thayer, ed. University of Oklahoma Papers in Anthropology 24(2): 221–242. * * de Reuse, Willem J. Central Siberian Yupik as a polysynthetic language. * * Sapir, Edward. (1911). Problem of noun incorporation in American Indian languages. ''American Anthropologist'', ''13'', 250–282. * Osborne, C.R., 1974. The Tiwi language. Canberra: AIAS * * * Shopen, Timothy. (1985). ''Language typology and syntactic description: Grammatical categories and the lexicon'' (Vol. 3). Cambridge: Cambridge University Press. * * * {{DEFAULTSORT:Polysynthetic Language Linguistic typology Grammar