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Lojban (pronounced like "lozh-bahn"; IPA [ˈloʒban]) is a multipurpose constructed language based around formal/symbolic logic to completely remove ambiguity in syntax.
Initially designed in an effort led by Dr. James Cooke Brown as Loglan (logical language), it was thought up to test the Sapir-Whorf hypothesis, which basically says that the language that a person speaks determines the way the person thinks. The idea was to attempt to create a language so different from natural languages, that the speakers would have to think differently. Think Newspeak, only without the dystopian nightmare to go with it.
Loglan further developed into Lojban, an improved version of it, which has now a significant internet community. The most prominent and unique feature of the Loglan family of languages is that they are designed to have the most unambiguous possible syntax. Additionally, the grammar is based on predicate logic.
Dr. Brown began work on Loglan in 1955, and announced the project in Scientific American in 1960. After completing the first version of the grammar and publishing the first dictionary, he created The Loglan Institute (TLI), which oversaw further development of the language. One problem with attempting to create a completely unambiguous language is that it requires a certain degree of perfectionism. Loglan was set back, often substantially, whenever computer-aided analysis discovered potential flaws in the language, necessitating a reformulation of the grammar.
In the early 1980s there was a great deal of internal conflict in TLI, largely between Brown, who considered Loglan to be a research project based on his own intellectual property, and other prominent Loglan speakers who were more concerned with broadening the community of Loglan speakers. The result was an apparent loss of interest on the part of many TLI members, particularly given that the revised grammar and vocabulary hadn't even been properly released. When some Loglan enthusiasts attempted to correct this by promoting the revised language, Brown proceeded to assert copyright over most of the vocabulary, which was apparently a logical way of spreading its use.
In response to these copyright claims, a new revision of Loglan was created, with a new public domain vocabulary, and The Logical Language Group (LLG) was created to promote and shepherd this offshoot. At one point the LLG won a court case against Brown over the right to call the new language "Loglan", a name which the LLG asserts can refer to any language in the family. However, in practice the offshoot's grammar is largely explained using words from the language itself, and so the language is almost always referred to as "Lojban" rather than "Loglan". Lojban's basic vocabulary and grammar were largely completed in 1993, although some features and definitions are still being tweaked by LLG committees. In addition, the vocabulary continues to grow with the creation and import of new words and phrases.
Loglan and TLI continue to exist, but have a dwindling community, and have not made much noise since the death of Dr. Brown in 2000.
The history of Loglan may be instructive with regards to constructed languages and the formation of new cultural communities generally. While James Cooke Brown was clearly the mastermind behind Loglan for the first few decades of its existence, the continued growth of the project seems to have required him to lose "ownership" over the language. Similarly, the future of Lojban may depend heavily on the success of the LLG at building and responding to a community much larger than itself.
Loglan has claimed many advantages over natural languages, particularly a lack of ambiguity, a grammar that can be easily parsed by computers, and a supposedly high degree of cultural neutrality (the vocabulary having been created by combining words from many different languages from around the world). It has also been proposed as a sort of official language of legalese, since it could presumably make legal documents unambiguous (unless they were really really vague).
Various Loglanists[Who?] have also expressed the hope (due to the Sapir-Whorf Hypothesis) that Lojban could eliminate certain types of logical fallacy and fuzzy thinking (the idea being that equivocation is not possible in an unambiguous language).
With that said, even Lojban has maintained at most several hundred community members, many of which may have only a moderate amount of proficiency and dedication regarding the language. Perhaps more damning, although Lojban is attempting to gain international support, most Lojban materials are either in English, Russian or in Lojban itself, making it more difficult for non-English-speakers to learn the language. Even more more damning, it's difficult to become fluent in a language with no native speakers and no possibility for immersion. Of course, that still didn't stop Klingon. Or Python for that matter.
 Lack of ambiguity
It is considered impossible to have a semantically unambiguous language; even a race of emotionless, logic-obsessed Vulcans would presumably misunderstand each other from time to time. Rather, Lojban aims for unambiguous syntax. Some consequences of this are: audio-visual isomorphism - Phonetic spelling, punctuation incorporated into speech; obvious word endings to remove potential homophones and homonyms; strict rules on pronunciation of foreign words; and a host of grammatical words (cmavo) to express the roles of other words, create tenses, introduce relative clauses, and comment on sentences.
Lojban attempts to separate the emotional or metaphorical content of sentences from their literal meaning. To do this, it introduces whole classes of words that are used solely to comment on sentences, or specific words within them. As a result, there are words for "this is a figurative statement" (pe'a), "this is funny" (zo'o), and "this makes me happy" (.ui).
There's a certain naive idealism about this system; often this sort of information is not conveyed at all through English words (it comes from context, nonverbal cues, and tone of voice). It can often feel unnatural to declare this context out loud. That said, there's a certain entertainment value in a language that tells you to exclaim "Wee!" every time something pleases you and "Oi!" when you're hurt.
Smileys and emotional abbreviations (like ":-)" or "ROFL") are unnecessary in Lojban chat. Instead of 8===D~, one simply says ".uosai ro'u".
 Community size
Although the precise number of Lojbanists is unknown, it is probably smaller than that of Esperanto, the largest conlang, and limited to the internet, that is, with very few physical conventions or institutions.
Compared to other conlangs, the idea behind Lojban (plus its predecessor and relatives) is creative and original. It likely accomplishes its promises of being culturally neutral (or, at least, not Eurocentric such as Esperanto, Volapük etc.) and logical. But the Lojban community is still tiny and with no apparent growth, and Lojban learning material is not multilingual enough. For a further, proper and better analysis,[please explain] it would need a more developed culture, and consequently a larger number of speakers.
- A multilingual Lojban wiki
- The Crash Course, a work-in-progress textbook
- a searchable dictionary
- An app to join the live chat to make friends or ask for help in learning Lojban
- Wave Lessons, another popular textbook
- the full reference grammar
- xorlo, an important recent change in the language
- Robert LeChevalier's take on the Loglan/Lojban split
- http://www.memrise.com/courses/english/lojban/ - is a great place where you can learn lojban words online. Just register on that website, try several courses and use the one that you like most
- a mailing list. This is where you can ask any questions.
- Main page of the Lojban-language version of Wikipedia
- ↑ "Logical language" in Lojban is "logji bangu". So "Lojban" is just a Lojban name for "Loglan". Creative.
- ↑ Note, however, that what is naturally unspoken in one language may be naturally spoken in another. For instance, in Japanese, it is common to plainly say "I feel nostalgic" (Natsukashii) when you do, even though this seems incredibly awkward in English.