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A constructed language is a for between (i.e. not with or between ) but unlike a language that emerges from human interaction, is intentionally devised for a particular purpose. Constructed language is often shortened to conlang, cloŋ, and even ŋ and is a relatively broad term that encompasses subcategories including: fictional, artificial, engineered, planned and invented. A constructed language may include natural language aspects including , , , and . includes the study of constructed languages.


History

Ancient linguistic experiments
Grammatical speculation dates from classical antiquity; for instance, it appears in 's Cratylus in Hermogenes's contention that words are not inherently linked to what they refer to; that people apply "a piece of their own voice ... to the thing".

tells the story of two figures, Dionysius of Sicily and Alexarchus:

  • Dionysius of Sicily created like menandros "virgin" (from menei "waiting" and andra "husband") for standard Greek parthenos; menekratēs "pillar" (from menei "it remains in one place" and kratei "it is strong") for standard stulos; and ballantion "javelin" (from balletai enantion "thrown against someone") for standard akon.
  • Alexarchus of Macedon, the brother of King of Macedon, was the founder of the city of . Athenaeus recounts a story told by Heraclides of Lembos that Alexarchus "introduced a peculiar vocabulary, referring to a rooster as a "dawn-crier", a barber as a "mortal-shaver", a drachma as "worked silver", ... and a herald as an aputēs from.

"He Alexarchus once wrote something ... to the public authorities in . ... As for what this letter says, in my opinion not even the could make sense of it."

While the mechanisms of grammar suggested by classical philosophers were designed to explain existing languages (, , and ), they were not used to construct new grammars. Roughly contemporary to Plato, in his descriptive grammar of Sanskrit, Pāṇini constructed a set of rules for explaining language, so that the text of his grammar may be considered a mixture of natural and constructed language.


Early constructed languages
A legend recorded in the seventh-century work Auraicept na n-Éces claims that Fénius Farsaid visited after the confusion of tongues, and he and his scholars studied the various languages for ten years, taking the best features of each to create in Bérla tóbaide ("the selected language"), which he named —the Irish language. This appears to be the first mention of the concept of a constructed language in literature.

The earliest non-natural languages were considered less "constructed" than "super-natural", mystical, or divinely inspired. The , recorded in the 12th century by St. Hildegard of Bingen, is an example, and apparently the first entirely artificial language.Joshua Foer, "John Quijada and Ithkuil, the Language He Invented", The New Yorker, 24 December 2012. It is a form of private mystical cant (see also ). An important example from Middle-Eastern culture is , invented in the 16th century. grammatical speculation was directed at recovering the original language spoken by Adam and Eve in , lost in the confusion of tongues. The first project for an ideal language is outlined in 's De vulgari eloquentia, where he searches for the ideal vernacular suited for literature. 's Ars Magna was a project of a perfect language with which the infidels could be convinced of the truth of the Christian faith. It was basically an application of on a given set of concepts.

(1997). 9780006863786, Fontana.
During the , Lullian and Kabbalistic ideas were drawn upon in a magical context, resulting in applications.


Perfecting language
Renaissance interest in , notably the discovery of the of , and first encounters with the directed efforts towards a perfect written language. Johannes Trithemius, in Steganographia and Polygraphia, attempted to show how all languages can be reduced to one. In the 17th century, interest in languages was continued by the and (like John Dee and his ). in 1623 spoke of a "natural language" ( Natursprache) of the senses.

from the Renaissance were often tied up with , magic and , sometimes also referred to as the language of the birds. A non-mystic musical language was .


17th and 18th century: advent of philosophical languages
The 17th century saw the rise of projects for "philosophical" or "a priori" languages, such as:

  • 's A Common Writing (1647) and The Groundwork or Foundation laid (or So Intended) for the Framing of a New Perfect Language and a Universal Common Writing (1652)
  • Sir 's Ekskybalauron (1651) and Logopandecteision (1652)
  • 's Ars signorum, 1661
  • ' An Essay towards a Real Character, and a Philosophical Language, 1668

These early taxonomic conlangs produced systems of hierarchical classification that were intended to result in both spoken and written expression. Leibniz had a similar purpose for his lingua generalis of 1678, aiming at a lexicon of characters upon which the user might perform calculations that would yield true propositions automatically, as a side-effect developing binary calculus. These projects were not only occupied with reducing or modelling grammar, but also with the arrangement of all human knowledge into "characters" or hierarchies, an idea that with the Enlightenment would ultimately lead to the Encyclopédie. Many of these 17th–18th centuries conlangs were , or purely written languages with no spoken form or a spoken form that would vary greatly according to the native language of the reader., "Al la historio de la Provoj de Lingvoj Tutmondaj de Leibnitz ĝis la Nuna Tempo", 1884. Reprinted in Fundamenta Krestomatio, UEA 1992 1903.

Leibniz and the encyclopedists realized that it is impossible to organize human knowledge unequivocally in a tree diagram, and consequently to construct an a priori language based on such a classification of concepts. Under the entry Charactère, D'Alembert critically reviewed the projects of philosophical languages of the preceding century. After the Encyclopédie, projects for a priori languages moved more and more to the lunatic fringe. Individual authors, typically unaware of the history of the idea, continued to propose taxonomic philosophical languages until the early 20th century (e.g. Ro), but most recent engineered languages have had more modest goals; some are limited to a specific field, like mathematical formalism or calculus (e.g. Lincos and programming languages), others are designed for eliminating syntactical ambiguity (e.g., and ) or maximizing conciseness (e.g., ).


19th and 20th centuries: auxiliary languages
Already in the Encyclopédie attention began to focus on a posteriori auxiliary languages. Joachim Faiguet de Villeneuve in the article on Langue wrote a short proposition of a "laconic" or regularized grammar of French. During the 19th century, a bewildering variety of such International Auxiliary Languages (IALs) were proposed, so that and Léopold Leau in Histoire de la langue universelle (1903) reviewed 38 projects.

The first of these that made any international impact was Volapük, proposed in 1879 by Johann Martin Schleyer; within a decade, 283 Volapükist clubs were counted all over the globe. However, disagreements between Schleyer and some prominent users of the language led to schism, and by the mid-1890s it fell into obscurity, making way for , proposed in 1887 by L. L. Zamenhof, and its . , the most recent auxlang to gain a significant number of speakers, emerged in 1951, when the International Auxiliary Language Association published its Interlingua–English Dictionary and an accompanying . The success of Esperanto did not stop others from trying to construct new auxiliary languages, such as Leslie Jones' , which mixes elements of English and Spanish.

(1955) and its descendants constitute a pragmatic return to the aims of the a priori languages, tempered by the requirement of usability of an auxiliary language. Thus far, these modern a priori languages have garnered only small groups of speakers.

Robot Interaction Language (2010) is a spoken language that is optimized for communication between machines and humans. The major goals of ROILA are that it should be easily learnable by the human user, and optimized for efficient recognition by computer speech recognition algorithms.


Categorization

By purpose
Most constructed languages can be divided by purpose:

  • Engineered language (engelang), further subdivided into logical language ( loglang), philosophical language and experimental language, devised for experimentation in , , or
  • International auxiliary language (auxlang or IAL), devised for interlinguistic or international communication
  • Artistic language (artlang), devised to create aesthetic pleasure or humorous effect; including sub-categories: secret language and mystical language

The boundaries between these categories are by no means clear, The "Conlang Triangle" by Raymond Brown. Accessed 8 August 2008 and a language could fall into more than one category. A logical language created for reasons would also be classifiable as an artistic language. One created with philosophical motives could also be used as an auxiliary language.


A priori and a posteriori
An constructed language is one with features not based on an existing language, and an a posteriori language is the opposite.
(2025). 9780143126461, Penguin Books.
This categorization, however, is not absolute, as many constructed languages may be called a priori when considering some linguistic factors, and at the same time a posteriori when considering other factors.

An a priori language has features that are invented or elaborated to work differently or to allude to different purposes. Some a priori languages are designed to be international auxiliary languages that remove what could be considered an unfair learning advantage for native speakers of a source language that would otherwise exist for a posteriori languages. Others, known as philosophical or taxonomic languages, try to categorize their vocabulary, either to express an underlying philosophy or to make it easier to recognize new vocabulary. Finally, many artistic languages, created for either personal use or for use in a fictional medium, employ consciously constructed grammars and vocabularies, and are best understood as a priori. Examples include:

International auxiliary

Experimental
  • Láadan by Suzette Haden Elgin (1982)
  • by John Quijada (2004)

Artistic

Community

An a posteriori language (from meaning "from the latter"), according to French linguist , is any constructed language whose elements are borrowed from or based on existing languages. The term can also be extended to controlled language, and is most commonly used to refer to vocabulary despite other features. Likewise, zonal auxiliary languages (auxiliary languages for speakers of a particular language family) are a posteriori by definition.

While most auxiliary languages are a posteriori due to their intended function as a medium of communication, many artistic languages are fully a posteriori in design—many for the purposes of alternate history. In distinguishing whether the language is a priori or a posteriori, the prevalence and distribution of respectable traits is often the key.

Examples of a posteriori languages:

Artistic
  • (Latin and Welsh) by Andrew Smith (1996)
  • Atlantean (Indo-European) by for the film (2001)
  • (various including English) by (2001)
  • (Latin and Polish) by Jan van Steenbergen (2002)
  • (English) by David Peterson for the TV series The 100 (2014)
  • (various indigenous North American) by Naxikeestan (2023)

Controlled auxiliary

International auxiliary

Zonal auxiliary


Sensitivity
The term planned language is sometimes used to classify an international auxiliary languageKlaus Schubert, Designed Languages for Communicative Needs within and between Language Communities, in: Planned languages and language planning (PDF), Austrian National Library, 2019 since the common alternative, artificial, may be perceived as pejorative. Outside Esperanto culture, the term language planning means the prescriptions given to a natural language to standardize it; in this regard, even a "natural language" may be artificial in some respects, meaning some of its words have been crafted by conscious decision. Prescriptive grammars, which date to ancient times for classical languages such as and , are rule-based codifications of natural languages, such codifications being a middle ground between naïve natural selection and development of language and its explicit construction. The term glossopoeia is also used to mean language construction, particularly construction of artistic languages.Sarah L. Higley: Hildegard of Bingen's Unknown Language. Palgrave Macmillan, 2007.

Classifications are used differently by tradition. For example, few speakers of consider their language artificial, since they assert that it has no invented content. Interlingua's vocabulary is taken from a small set of natural languages, and its grammar is based closely on these source languages, even including some degree of irregularity. Its proponents prefer to describe its vocabulary and grammar as standardized rather than artificial or constructed. Similarly, Latino sine flexione (LsF) is a simplification of Latin from which the have been removed. As with Interlingua, some prefer to describe its development as planning rather than constructing. Some speakers of and also avoid the term artificial language because they deny that there is anything unnatural about it.


Accuracy
Some argue that all human language is artificial; not natural.François Rabelais's fictional giant Pantagruel said: "It is a misuse of terms to say that we have natural language; languages exist through arbitrary institutions and the conventions of peoples. Voices, as the dialecticians say, don't signify naturally, but capriciously."François Rabelais, Œuvres complètes, III, 19 (Paris: Seuil, 1973). Also cited in Claude Piron, Le Défi des Langues (L'Harmattan, 1994) .


Naturalistic
Fictional or experimental languages can be considered naturalistic if they model real world languages. For example, if a naturalistic conlang is derived a posteriori from another language (real or constructed), it should imitate natural processes of , , and change. In contrast with languages such as Interlingua, naturalistic fictional languages are not usually intended for easy learning or communication. Thus, naturalistic fictional languages tend to be more difficult and complex. While Interlingua has simpler grammar, syntax, and orthography than its source languages (though more complex and irregular than Esperanto or its descendants), naturalistic fictional languages typically mimic behaviors of natural languages like and nouns, and complicated phonological processes.


Rationale
Reasons to create a constructed language include: to ease human ; to give or an associated constructed setting an added layer of realism; for experimentation in the fields of , cognitive science, and ; for artistic creation; for fantasy role-playing games; and for . Some people may also make constructed languages as a , or in connection to .

A famous but disputed Sapir–Whorf hypothesis is sometimes cited which claims that the language one speaks influences the way one thinks. Thus, a better language should allow the speaker to think better more clearly or intelligently or to encompass more points of view. This was the intention of Suzette Haden Elgin in creating Láadan, a feminist language embodied in her feminist science fiction series Native Tongue."My hypothesis was that if I constructed a language designed specifically to provide a more adequate mechanism for expressing women's perceptions, women would (a) embrace it and begin using it, or (b) embrace the idea but not the language, say "Elgin, you've got it all wrong!" and construct some other "women's language" to replace it." Constructed languages have been included in standardized tests such as the , where they were used to test the applicant's ability to infer and apply grammatical rules. By the same token, a constructed language might also be used to restrict thought, as in 's , or to simplify thought, as in . However, linguists such as argue that ideas exist independently of language. For example, in the book The Language Instinct, Pinker states that children spontaneously re-invent slang and even grammar with each generation. These linguists argue that attempts to control the range of human thought through the reform of language would fail, as concepts like "freedom" will reappear in new words if the old words vanish.

Proponents claim a particular language makes it easier to express and understand concepts in one area, and more difficult in others. An example can be taken from the way various programming languages make it easier to write certain kinds of programs and harder to write others.

Another reason cited for using a constructed language is the telescope rule, which claims that it takes less time to first learn a simple constructed language and then a natural language, than to learn only a natural language. Thus, if someone wants to learn English, some suggest learning first. Constructed languages like Esperanto and Interlingua are in fact often simpler due to the typical lack of irregular verbs and other grammatical quirks. Some studies have found that learning Esperanto helps in learning a non-constructed language later (see propaedeutic value of Esperanto).


Development
Most modern developers, called , create conlangs as a hobby, for a fictional work, or for personal fulfillment. Conlangers typically create languages by defining their conlang's , , , and other properties. Doing so requires at least a rudimentary understanding of .

Various papers on constructed languages were published from the 1970s through the 1990s, such as Glossopoeic Quarterly, Taboo Jadoo, and The Journal of Planned Languages. "How did you find out that there were other conlangers?" Conlang list posting by And Rosta, 14 October 2007 The Conlang Mailing List was founded in 1991, and later split off an AUXLANG mailing list dedicated to international auxiliary languages. In the early to mid-1990s a few conlang-related zines were published as email or websites, such as Vortpunoj Archives of Vortpunoj at Steve Brewer's website and Model Languages. The Conlang mailing list has developed a community of conlangers with its own customs, such as translation challenges and translation relays, Audience, Uglossia, and Conlang: Inventing Languages on the Internet by Sarah L. Higley. M/C: A Journal of Media and Culture 3.1 (2000). (, media-culture.org.au site sometimes has problems.) and its own terminology. Sarah Higley reports from results of her surveys that the demographics of the Conlang list are primarily men from North America and western Europe, with a smaller number from Oceania, Asia, the Middle East, and South America, with an age range from thirteen to over sixty; the number of women participating has increased over time.

Later online communities include the Bulletin Board (ZBB; since 2001) and the Conlanger Bulletin Board. Discussion on these forums includes presentation of members' conlangs and feedback from other members, discussion of natural languages, whether particular conlang features have natural language precedents, and how interesting features of natural languages can be repurposed for conlangs, posting of interesting short texts as translation challenges, and meta-discussion about the philosophy of conlanging, conlangers' purposes, and whether conlanging is an art or a hobby. Another 2001 survey by Patrick Jarrett showed an average age of 30.65, with the average time since starting to invent languages 11.83 years. "Update mailing list statistics—FINAL", Conlang list posting by Patrick Jarrett, 13 September 2001 A more recent thread on the ZBB showed that many conlangers spend a relatively small amount of time on any one conlang, moving from one project to another; about a third spend years on developing the same language. "Average life of a conlang" thread on Zompist Bulletin Board, 15 August 2008; accessed 26 August 2008.
"Average life of a conlang" thread on Conlang mailing list, 27 August 2008 (should be archived more persistently than the ZBB thread)

One constraint on a constructed language is that if it was constructed to be a natural language for use by fictional characters, as with Dothraki and in the Game of Thrones series, the language should be easily pronounced by actors, and should fit with and incorporate any fragments of the language already invented by the book's author, and preferably also fit with any personal names of fictional speakers of the language.


Organic change
When a constructed language has a community of speakers, especially a large population, it tends to evolve and hence loses its constructed nature. For example, and its pronunciation norms were developed from existing traditions of , such as and following a general pronunciation, rather than engineered from scratch, and has undergone considerable changes since the state of was founded in 1948 (Hetzron 1990:693). However, linguist Ghil'ad Zuckermann argues that Modern Hebrew, which he terms "Israeli", is a Semito-European hybrid based not only on Hebrew but also on and other languages spoken by revivalists. Hybridity versus Revivability: Multiple Causation, Forms and Patterns, Ghil'ad Zuckermann, Journal of Language Contact, Varia 2, pp. 40–67 (2009). Zuckermann therefore endorses the translation of the Hebrew Bible into what he calls "Israeli". Let my people know! , Ghil'ad Zuckermann, Jerusalem Post, 18 May 2009. as a living spoken language has evolved significantly from the prescriptive blueprint published in 1887, so that modern editions of the Fundamenta Krestomatio, a 1903 collection of early texts in the language, require many footnotes on the syntactic and lexical differences between early and modern Esperanto. Fundamenta Krestomatio, ed. L. L. Zamenhof, 1903; 18th edition with footnotes by Gaston Waringhien, UEA 1992.


Acceptance
Conlang speakers are rare. For example, the of 2011 found 8,397 speakers of , and the census of 2001 found 10 of , two each of and and one each of and . The census of 2010 found that in Russia there were about 992 speakers of Esperanto (the 120th most common) and nine of the .

According to , there are 200–2000 who speak Esperanto as a first language.

d'Armond Speers, a member of the Klingon Language Institute, attempted to raise his son as bilingual; using both English and the constructed .


Identification codes
Codes for constructed languages include the ISO 639-2 "art" for conlangs; however, some constructed languages have their own ISO 639 language codes (e.g. "eo" and "epo" for , "jbo" for , "ia" and "ina" for , "tlh" for , "io" and "ido" for , "lfn" for Lingua Franca Nova, and "tok" for ).


Ownership
The matter of whether a constructed language can be owned or protected by intellectual property laws, or if it would even be possible to enforce those laws, is contentious.

In a 2015 lawsuit, and Paramount Pictures challenged a fan film project called Axanar, stating the project infringed upon their intellectual property, which included the , among other creative elements. During the controversy, Marc Okrand, the language's original designer expressed doubt as to whether Paramount's claims of ownership were valid.Bhana, Yusuf, Can you copyright a language? Translate Media, 6 June 2019Gardner, Eriq, Crowdfunded 'Star Trek' Movie Draws Lawsuit from Paramount, CBS Hollywood Reporter, 30 December 2015

David J. Peterson, who created multiple well-known constructed languages including the Valyrian languages and Dothraki, advocated a similar opinion, saying that "Theoretically, anyone can publish anything using any language I created, and, in my opinion, neither I nor anyone else should be able to do anything about it."Owen, Becky, Can you copyright a fictional language? Copyright Licensing Agency, 26 September 2019

However, Peterson also expressed concern that the respective rights-holders—regardless of whether or not their ownership of the rights is legitimate—would be likely to sue individuals who publish material in said languages, especially if the author might profit from said material.

Furthermore, comprehensive learning material for such constructed languages as and Klingon has been published and made freely accessible on the language-learning platform —but those courses are licensed by the respective copyright holders. Because only a few such disputes have occurred thus far, the legal consensus on ownership of languages remains uncertain.

The Tasmanian Aboriginal Centre claims ownership of , an attempted composite reconstruction of up to a dozen extinct Tasmanian indigenous languages, and has asked Wikipedia to remove its article on the project. However, there is no current legal backing for the claim.


See also
  • List of constructed languages
  • Aboriginal constructed languages: ,
  • Cant (language)
  • ISO, SIL, and BCP language codes for constructed languages
  • Language construction
    • Artificial script
    • Language Construction Kit
    • Language regulator
    • List of language inventors
  • Language modelling and translation
    • Knowledge representation
    • Language translation
    • Universal grammar
  • Mystical languages
  • Spontaneous emergence of grammar
    • Artificial language
    • June and Jennifer Gibbons
    • Nicaraguan Sign Language
    • Origin of language
    • Poto and Cabengo
  • Linguistic determinism
  • Linguistic relativity
  • Universal language
  • In the Land of Invented Languages


Notes
  • (1995). 9780631174653, Blackwell. .
  • (1990). 9780195065114, Oxford University Press. .
  • Couturat, Louis (1907). Les nouvelles langues internationales. Paris: Hachette. With Léopold Leau. Republished 2001, Olms.
  • Couturat, Louis (1910). Étude sur la dérivation dans la langue internationales. Paris: Delagrave. 100 p.
  • (2025). 9783895866678, Lincom Europa.
  • (2025). 9780385527880, Spiegel & Grau. .
  • (2025). 9780143126461, Penguin Books.
  • "Babel's modern architects", by Amber Dance. The Los Angeles Times, 24 August 2007 (Originally published as "In their own words -- literally")


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