Lojban

Lojban (pronounced [ˈloʒban] ) is a logical, constructed, human language created by the Logical Language Group which aims to be syntactically unambiguous. It succeeds the Loglan project.

Lojban
la .lojban.
Pronunciation[laʔ ˈloʒbanʔ]
Created byLogical Language Group
Date1987
Setting and usagea logically engineered language for various usages
Purpose
Primarily Latin, others available
SourcesLoglan
Language codes
ISO 639-2jbo
ISO 639-3jbo
Glottologlojb1234

The Logical Language Group (LLG) began developing Lojban in 1987. The LLG sought to realize Loglan's purposes and further improve the language by making it more usable and freely available (as indicated by its official full English title, Lojban: A Realization of Loglan). After a long initial period of debating and testing, the baseline was completed in 1997 and published as The Complete Lojban Language. In an interview in 2010 with The New York Times, Arika Okrent, the author of In the Land of Invented Languages, stated, "The constructed language with the most complete grammar is probably Lojban—a language created to reflect the principles of logic."[1]

Lojban is proposed as a speakable language for communication between people of different language backgrounds, as a potential means of machine translation, and as a tool to explore the intersection between human language and software.[2]

Etymology

The name "Lojban" is a compound formed from loj and ban, which are short forms of logji (logic) and bangu (language).

History

Lojban's predecessor, Loglan, a language invented by James Cooke Brown in 1955 and later developed by The Loglan Institute, was originally conceived as a means to examine the influence of language on the speaker's thought (an assumption known as the Sapir–Whorf hypothesis).

As Brown started to claim his copyright[3][4] on the language's components, bans were put on the language community's activities to stop changes to aspects of the language. In order to circumvent such control, a group of Loglan users decided to initiate a separate project, departing from the lexical basis of Loglan and reinventing the whole vocabulary, which led to the current lexicon of Lojban. To this effect, they established The Logical Language Group in 1987, based in Washington, D.C. They also won a trial over whether they could call their version of the language Loglan.[5]

The phonetic form of Lojban gismu (root words) was created algorithmically by searching for sound patterns in words with similar meanings in world languages and by weighting those sound patterns by the number of speakers of those languages. The list of source languages used for the algorithm was limited to the six most widely spoken languages as of 1987—Mandarin, English, Hindi, Spanish, Russian, and Arabic. This resulted in root words being in their phonetic form a relatively equal mixture of English and Mandarin, with lesser influences from the other four.[6][7][8]

Lojban also utilizes a set of evidential indicators adapted from the constructed language Láadan.[9]

Following the publication of The Complete Lojban Language, it was expected that the documented lexicon would be baselined, and the combination of lexicon and reference grammar would be frozen for a minimum of 5 years while language usage grew.[10] As scheduled, this period, which has officially been called the freeze, expired in 2002. The speakers of Lojban are now free to construct new words and idioms, and decide where the language is heading.

Applications

While the initial aim of the Loglan project was to investigate linguistic relativity, the active Lojban community recognizes additional applications for the language, including:

As a speakable language

Lojban is practiced by its speakers in text and voice chats.[11][12]

Learning aids

Apart from the actual practice of the language, some members of the community and LLG have been endeavoring to create various aids for the learners. The Complete Lojban Language (CLL, also known as The Red Book because of its color, and The Codex Woldemar, after its author), the definitive word on all aspects of Lojban, is one of them, finalized in 1997. Some of the projects in varying stages of completeness are:

  • Different textbooks, presentations to help learning Lojban[13]
  • la muplis, an application listing Lojban sentences from Tatoeba database with their translation to other languages[14]
  • Parser: la ilmentufa[15] (also includes experimental grammar), la camxes[16] (by Robin Lee Powell and Jorge Llambías), la jbofi'e[17] (by Richard Curnow)
  • Database: la jbovlaste (initial version by Jay Kominek)

Lojban's learning resources on the internet are available mainly to speakers of English, French, Spanish, Russian, Hebrew, and Esperanto, to varying degrees.[18]

As a literary and cultural language

Like most languages with few speakers, Lojban lacks much of an associated body of literature and its creative extensions have not been fully realized (the true potential of its attitudinal system, for example, is considered unlikely to be drawn out until and unless children are raised entirely in a multi-cultural Lojban-speaking environment[19]). Also such collective or encyclopedic sources of knowledge like the Lojban Wikipedia, which may help expand the language's lexical horizon, are not very well developed.

Presently accessible Lojbanic writings are principally concentrated on Lojban.org,[20] though there exist independent Lojbanic blog/journal sites as well. The Lojban IRC[21] (or its archive[22]) has a gathering of Lojbanic expressions too, but its grammatical correctness is not always guaranteed. These available materials on the internet include both original works and translations of classic pieces in the field of natural languages, ranging from poetry, short story, novel, and academic writing. Examples of works that are already available include:

Lojban has also been used in other media. For example, the videogame Minecraft has been partially translated into Lojban.[29][30]

As a means of creativity

Lojban is seen by some as an intellectual device for creative writing or as having many potential aspects yet to be discovered or explored.

Dan Parmenter:

The removal of grammatical ambiguity from modification [...] seems to heighten creative exploration of word combination. [...] Other areas of possible benefit are (surprisingly in a 'logical' language) emotional expression. Lojban has a fully developed set of metalinguistic and emotional attitude indicators that supplant much of the baggage of aspect and mood found in natural languages, but most clearly separate indicative statements from the emotional communication associated with those statements. This might lead to freer expression and consideration of ideas, since stating an idea can be distinguished from supporting that idea. The set of possible indicators is also large enough to provide specificity and clarity of emotions that is difficult in natural languages.

John Cowan:

There is a marker for "figurative speech" which would be used on "back stabber" and would signal "There is a culturally dependent construction here." The intent is not that everything is instantly and perfectly comprehensible to someone who knows only the root words, but rather that non-root words are built up creatively from the roots. Thus "heart pain" would refer to the literal heart and literal pain; what would be ambiguous would be the exact connection between these two. Is the pain in the heart, because of the heart, or what? But "heart pain" would not be a valid tanru for "emotional pain", absent the figurative speech marker.[31]

The language was built to attempt to remove some limits on human thought; these limits are not understood, so that the tendency is to try to remove restrictions whenever we find the language structure gets in our way. You definitely can talk nonsense in Lojban.

Bob LeChevalier:

In Lojban, a little grammar makes for a lot of semantic fun, since the grammar doesn't interfere with the semantic quibble you love. [...] In addition to its grammar, Lojban is definitely a priori in its words. [...] We presume that everything can be covered as compounds of the classification scheme implied by the gismu [root words]. [...] We haven't, though, tried to impose a system on the universe like most a priori languages have. Instead, we have tried to broaden gismu flexibility so that multiple approaches to classifying the universe are possible. Our rule is that any word have one meaning, not that any meaning have one word. There is no 'proper' classification scheme in Lojban. [...] Lojban offers a new world of thought.[32]

As a potential machine interlingua

There have been proposals[33][34][35][36][37][38] to use Lojban as an intermediate language in interlingual machine translation and knowledge representation.

As a programming language

Constructs in programming languages have been shown[39][40] to be translated to Lojban.

Like with some programming languages Lojban grammar can be parsed using parsing expression grammars.[41][42]

As a speakable logic

Lojban has been shown[43] to be translated in some of its parts into predicate logic. There are also analogies[44] between Lojban and combinatory logic.

Linguistic properties

Lojban:

  • is designed to express complex logical constructs precisely.
  • has no irregularities or ambiguities in spelling and grammar (although word derivation relies on arbitrary variant forms). This gives rise to high intelligibility for computer parsing.
  • is designed to be as culturally neutral as possible.
  • allows highly systematic learning and use, compared to most natural languages.
  • possesses an intricate system of indicators which effectively communicate contextual attitude or emotions.

Grammar

Phonology and orthography

Lojban has 6 vowels and 18 consonants. Some of them have, apart from the preferred/standard sounds, permitted variants intended to cover dissimilitude in pronunciation by speakers of different linguistic backgrounds.

Stress normally falls on the penultimate syllable.

There are 16 diphthongs (and no triphthongs). A distinction between diphthongs and monophthongs can be written by inserting a comma in the Latin alphabet. Vowel hiatus is also prevented by inserting an apostrophe, which usually indicates [h], though there are other valid realizations. For those who have trouble pronouncing certain consonant clusters, there is the option of adding vowels between them (epenthesis), as long as they differ sufficiently from the phonological vowels and are pronounced as short as possible. The resulting additional syllables are not factored in the grammar, including for the purposes of stress determination.

Lojban is written almost entirely with lower-case letters; upper-case letters are used to mark stress in words that do not fit the normal rules of stress assignment, or when whitespace is omitted.

The letters in Lojban and their respective pronunciations are shown in the table below. The IPA symbols in parentheses indicate alternative pronunciations; preferred pronunciations have no parentheses.

Lojban consonant phonemes
Labial Alveolar Postalveolar Velar Glottal
Nasal /m/[decimal 1]/n/[decimal 1]
Plosive voiceless /p//t//k//ʔ/
voiced /b//d//ɡ/
Fricative voiceless /f/ ([ɸ])/s//ʃ/ ([ʂ])/x//h/ ([θ])
voiced /v/ ([β])/z//ʒ/ ([ʐ])
Approximant /l/[decimal 1]
Rhotic /r/[decimal 1][decimal 2]
Lojban vowel phonemes
Front Central Back
Close /i//u/
Mid /ɛ/ ([e])/ə//o/ ([ɔ])
Open /a/ ([ɑ])
Letters Auxiliary characters
IPA [a]
([ɑ])
[b] [ʃ]
([ʂ])
[d] [ɛ]
([e])
[f]
([ɸ])
[ɡ] [i] [ʒ]
([ʐ])
[k] [l][decimal 1] [m][decimal 1] [n][decimal 1] [o]
([ɔ])
[p] [r][decimal 1][decimal 2] [s] [t] [u] [v]
([β])
[x] [ə] [z] [h]
([θ])
[ʔ] .
Latin a b c d e f g i j k l m n o p r s t u v x y z ' . ,
  1. Sonorants /m n l r/ may be syllabic.
  2. There is no preferred sound for /r/; any rhotic sound is equally acceptable.

In principle, Lojban may be written in any orthographic system as long as it satisfies the required regularities and unambiguities. Some of the reasons for such elasticity would be as follows:

  1. Lojban is defined by the phonemes rather than graphemes; as long as they are correctly rendered so as to maintain the Lojbanic audio-visual isomorphism, a representational system can be said to be an appropriate orthography of the language;
  2. Lojban is meant to be as culturally neutral as possible, so it is never crucial or fundamental to claim that some particular orthography of some particular languages (e.g. the Latin alphabet) should be the dominant mode.

Some Lojbanists extend this principle of cultural neutrality and assert that Lojban should have its own alphabet.[45]

This article uses the common Latin alphabet mode.

Morphology

Lojban has three word-classes: predicate words (brivla), structure words (cmavo), and name words (cmevla). Each of them has uniquely identifying properties, so that one can unambiguously recognize which word is of which part of speech in a string of the language. They may be further divided in sub-classes. There also exists a special fragmental form (rafsi) assigned to some predicate words and structure words, from which compound predicate words (lujvo) may be created.[46][47]

Syntax and semantics

The language's grammatical structures are "defined by a set of rules that have been tested to be unambiguous using computers", which is in effect called the "machine grammar".[48] Hence the characteristics of the standard syntactic (not semantic) constructs in Lojban:

  • each word has exactly one grammatical interpretation;
  • the words relate grammatically to each other in exactly one way.

Such standards, however, are to be attained with certain carefulness:

It is important to note that new Lojbanists will not be able to speak 'perfectly' when first learning Lojban. In fact, you may never speak perfectly in 'natural' Lojban conversation, even though you achieve fluency in the language. No English speaker always speaks textbook English in natural conversation; Lojban speakers will also make grammatical errors when talking quickly. Lojbanists will, however, be able to speak or write unambiguously if they are careful, which is difficult if not impossible with a natural language.

Nick Nicholas and John Cowan. 'What Is Lojban? II.3

The computer-tested, unambiguous rules also include grammar for incomplete sentences e.g. for narrative, quotational, or mathematical phrases.

Its typology can be said to be basically subject–verb–object and subject–object–verb. However, it can practically have any order:

  • mi prami do (SVO) (I love you)
  • mi do prami (SOV) (By me, you are loved)
  • do se prami mi (OVS) (You are loved by me)
  • do mi se prami (OSV) (You, I love)
  • prami fa mi do (VSO) (Loved by me, you are)
  • prami do fa mi or se prami fa do mi (VOS) (Love you, I do)

Such flexibility has to do with the language's intended capability to translate as many expressions of natural languages as possible, based on a unique positional case system. The meaning of the sentence mi prami do is determined by prami realizing, with its own predefined place structure, a specific semantic relation between mi and do; when the positional relation between mi and do changes, the meaning of the sentence changes too. As shown above, Lojban has particular devices to preserve such semantic structure of words while altering their order.

As befits a logical language, there is a large assortment of logical connectives. Such conjunction words take different forms depending on what they connect, another reason why the (standard) Lojbanic expressions are typically precise and clear.

Multiple predicate words may be linked up together so as to narrow the semantic scope of the phrase. In sutra dansu "to quickly dance", the modifying word sutra narrows the sense of the modified word dansu to form a more specific concept (in which case the modifier may resemble English adverbs or adjectives). One could go still further, adding a quite extreme example of its syntactic flexibility.

Lojban can easily imitate even one-word sentences from polysynthetic languages, for example:

Nuu-chah-nulth language: inkiwihl'minik'isit

inkiw

fire/burn

-ihl

in-the-house

-'minik

PL

-'is

DIM

-'it

PAST

inkiw -ihl -'minik -'is -'it

fire/burn in-the-house PL DIM PAST

which can be expressed in Lojban the same way:

fagykemyzdanerso'icmapru

fire-type-house-inside-many-small-past-event

fagykemyzdanerso'icmapru

fire-type-house-inside-many-small-past-event

Lexicon

Compound words (lujvo) and borrowed words (fu'ivla) are continually increasing as the speakers find demands. The number of root words (gismu) and structure words (cmavo) are basically unchanging, but new inventions are to be accepted as experimental components. In fact, it has been noticed that particular inclination or disproportion exists in the available vocabulary. Cortesi[49] has pointed out the lack of certain terms for mathematics and geometry (although this demand may now be disputed as the current set of Lojban vocabulary does actually allow speakers to express such notions as steradian (stero), trigonometric tangent (tanjo), multiplicative inverse (fa'i), matrix transpose (re'a) among a number of other kinds of operators or metric units). Other instances which require speakers to construct noncanonical words:

  • There are few entries of African country names on the official list of root words while other country names (especially those with large populations of speakers of the six source languages) are covered to a remarkable extent.
  • Such distinction as between palne (tray) and palta (plate) exist while no distinction between illustration and photography is made by the available set of gismu (that is, no exclusive root word for photography exists except the generic pixra (picture)) (see also – Grammar: Morphology: brivla: gismu).

Samples

Common phrases

Lojban literal meaning English
coi/co'o coi/co'ohello/goodbyehello!/good-bye!
pe'u pe'upleaseplease!
ki'e ki'ethanksthanks!
.u'u u'u(repentance)I'm sorry!
xu do se glibau/jbobau xu do se glibau/jbobauis-it-true-that you be-a-speaker-of-English-language / is-a-speaker-of-Lojban-languageDo you speak English / Lojban?
ti/ta/tu ti/ta/tuthis/that/that-over-therethis one/that one/that yonder
mi na jimpe mi na jimpeI not-true-that understandI don't understand
go'i go'i(the last clause)yes, that's true
na go'i na go'inot-true-that (the last clause)no, that's false
la'u ma la'u mabeing-a-quantity-of what?How much, how many?
ma jdima ma jdimawhat is-the-priceWhat's the cost?
lo vimku'a cu se stuzi maloo (tail of the clause follows) is-located-at what?Where's the bathroom?

Unique Lojbanic expressions

Lojban .oiro'obu'o naipei
Gloss attitudinal: pain!in physical senseattitude endswhat's your attitude?
Translation Are you no longer in pain?
Lojban minelciko
Gloss Ilikeimperative "you"
Translation Make it so that I like you!
Lojban locuktakube'uzvatima
Gloss that whichis book(s)end of noun phraseattitudinal: need!is located atwhat?
Translation I need a book! Where is it?
Lojban koga'i naiklamalonenribelomizdani
Gloss imperative "you"attitudinal: meekness!come tothat whichis inside of[attach arguments of noun]that whichmyis home
Translation I would be honored if you would enter my residence.
Lojban se ri'agimijgarilodjacugimijgarilokabri
Gloss with physical effectof (Igraspthat whichis some water)Igraspthat whichis cup
Translation I grasp water, since I grasp a cup.

The North Wind and the Sun

A translation of The North Wind and the Sun.[50]

la berti brife jo'u la solri

ni'o la berti brife jo'u la solri pu troci lo ka cuxna lo poi me vo'a vau traji be lo ka vlipa i ca'o bo lo pa litru noi dasni lo glare kosta cu klama

.i le re mei pu simxu lo ka tugni fi lo nu lo traji be lo ka clira fa lo nu ce'u snada lo ka gasnu lo nu le litru co'u dasni le kosta cu traji lo ka vlipa

.i ba bo la berti brife co'a traji cupra lo brife i ku'i lo nu by by zenba lo ka cupra lo xo kau brife cu rinka lo nu le litru zu'e ri zenba lo ka se tagji le kosta i ba bo la berti brife co'u troci i ba bo la solri co'a glare dirce i ba zi bo le litru co'u dasni le kosta

.i se ki'u bo la berti brife cu bilga lo ka tugni fi lo nu la solri cu traji lo ka vlipa

A Lojbanic poem (audio)

Contributors

Below are some of the notable personalities who have contributed to the development of Lojban:

  • Bob LeChevalier (also known as la lojbab): the founder and the President of the LLG.[51]
  • Robin Lee Powell (also known as la camgusmis): the author of a novel-sized story, la nicte cadzu (Night Walkers).
  • Jorge Llambías (also known as la xorxes): one of the most active Lojbanists, having done several translations. He is also a prominent figure on the mailing list, helping beginners with the language.
  • John W. Cowan: the author of The Complete Lojban Language.
  • Miles Forster (also known as la selpa'i): a German Lojbanist who wrote the song ca pa djedi[52] and made several large translations into Lojban.
  • Robin Turner: a British philosopher and linguist living in Turkey, and coauthor of Lojban For Beginners.
  • Nick Nicholas (also known as la nitcion): an Australian linguist, and coauthor of Lojban For Beginners.

Comparison with other logical languages

Loglan

The principal difference between Lojban and Loglan is one of lexicon. The words for Lojban were made by the same principles as those for Loglan; that is, candidate forms were chosen according to how many sounds they had in common with their equivalent in some of the most commonly spoken languages on Earth, which was then multiplied by the number of speakers of the languages with which the words had letters in common. The difference with the Lojban remake of the root words was that the weighting was updated to reflect the actual numbers of speakers for the languages. This resulted in word forms that had fewer sounds taken from English, and more sounds taken from Chinese. For instance, the Loglan word norma is equivalent to the Lojban word cnano (cf. Chinese 常, pinyin cháng), both meaning "normal".

Loglan and Lojban still have essentially the same grammars, and most of what is said in the Grammar section above holds true for Loglan as well. Most simple, declarative sentences could be translated word by word between the two languages.

In the new phonology for Lojban, the consonant q and the vowel w were removed, and the consonant h was replaced by x. The consonant ' (apostrophe) was added with the value of [h] in the International Phonetic Alphabet, but its distribution is such that it can appear only intervocally, and in discussions of the morphology and phonotactics, it is described not as a proper consonant, but a "voiceless glide". (This phoneme is realized as θ by some speakers.)

gua\spi

gua\spi is a descendant of Loglan but is tonal, developed by Jim Carter. Instead of structure words there are in Gua\spi six different tones. Predicates have only one syllable instead of two. Some of its characteristics, including tones, phonotactics, expressions for masses vs sets, non-existence of metalinguistic negation, etc., received criticism.[53]

See also


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