Overview
Constructed languages are categorized as either a priori languages or a posteriori languages. The grammar and vocabulary of the former are created from scratch, either by the author's imagination or by computation; the latter possess a grammar and vocabulary derived from natural language.
In turn, a posteriori languages are divided into schematic languages, in which a natural or partly natural vocabulary is altered to fit pre-established rules, and naturalistic languages, in which a natural vocabulary retains its normal sound and appearance. While Esperanto is generally considered schematic, Interlingua is viewed as naturalistic. Ido is presented either as a schematic language or as a compromise between the two types.
Further, fictional and experimental languages can be naturalistic in that they are meant to sound natural, have realistic amounts of irregularity, and, if derived a posteriori from a real-world natural language or real-world reconstructed proto-language (such as Vulgar Latin or Proto-Indo-European) or from a fictional proto-language, they try to imitate natural processes of phonological, lexical and grammatical change. In contrast with Interlingua, these languages are not usually intended for easy learning or communication; and most artlangers would not consider Interlingua to be naturalistic in the sense in which this term is used in artlang criticism. Thus, a naturalistic fictional language tends 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 Ido), naturalistic fictional languages typically mimic behaviors of natural languages like irregular verbs and nouns and complicated phonological processes.
In terms of purpose, most constructed languages can broadly be divided into:
- Engineered languages (engelangs /ˈɛnd͡ʒlæŋz/), further subdivided into logical languages (loglangs), philosophical languages and experimental languages; devised for the purpose of experimentation in logic, philosophy, or linguistics;
- Auxiliary languages (auxlangs) devised for international communication (also IALs, for International Auxiliary Language);
- Artistic languages (artlangs) devised to create aesthetic pleasure or humorous effect, just for fun; usually secret languages and mystical languages are classified as artlangs
The boundaries between these categories are by no means clear. A constructed language could easily fall into more than one of the above categories. A logical language created for aesthetic reasons would also be classifiable as an artistic language, which might be created by someone with philosophical motives intending for said conlang to be used as an auxiliary language. There are no rules, either inherent in the process of language construction or externally imposed, that would limit a constructed language to fitting only one of the above categories.
A constructed language can have native speakers if young children learn it from parents who speak it fluently. According to Ethnologue, there are "200–2000 who speak Esperanto as a first language" (most famously George Soros). A member of the Klingon Language Institute, d'Armond Speers, attempted to raise his son as a native (bilingual with English) Klingon speaker.
As soon as a constructed language has a community of fluent speakers, especially if it has numerous native speakers, it begins to evolve and hence loses its constructed status. For example, Modern Hebrew was modeled on Biblical Hebrew rather than engineered from scratch, and has undergone considerable changes since the state of Israel 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 Yiddish and other languages spoken by revivalists. Zuckermann therefore endorses the translation of the Hebrew Bible into what he calls "Israeli". Esperanto 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.
Proponents of constructed languages often have many reasons for using them. The famous but disputed Sapir–Whorf hypothesis is sometimes cited; this claims that the language one speaks influences the way one thinks. Thus, a "better" language should allow the speaker to think more clearly or intelligently or to encompass more points of view; this was the intention of Suzette Haden Elgin in creating Láadan, the language embodied in her feminist science fiction series Native Tongue. A constructed language could also be used to restrict thought, as in George Orwell's Newspeak, or to simplify thought, as in Toki Pona. In contrast, linguists such as Stephen Pinker argue that ideas exist independently of language. Thus, children spontaneously re-invent slang and even grammar with each generation. (See The Language Instinct.) If this is true, 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 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 computer 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; this 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 Basic English first. Constructed languages like Esperanto and Ido 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).
The ISO 639-2 standard reserves the language code "art" to denote artificial languages. However, some constructed languages have their own ISO 639 language codes (e.g. "eo" and "epo" for Esperanto, "io" and "ido" for Ido, "ia" and "ina" for Interlingua, "qny" for Quenya).
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