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Lojban (pronounced [ˈloʒban]) is an experiment in human language – a constructed language based on formal logic.

What is Lojban?

a «lightning talk» introduction to Lojban by Timo Paulssen
«ro lo ma'a datka» and other Lojban songs by la guskant

Lojban is a carefully constructed spoken language. It has been built for over 50 years by dozens of workers and hundreds of supporters.

  • Lojban's grammar is simpler than of most natural languages, but complex in its own unique way. Lojban is an experiment in thought, as well: its users aim to see how its unique language structures affect thought and understanding.
  • Lojban allows the expression of tiny nuances in emotion, using words called attitudinals, which are essentially spoken emoticons.
  • Lojban allows you to communicate concisely without unnecessary or undesired details. For example, you don't have to always think of what tense (past, present or future) to use in a verb when it's already clear from context.
  • Lojban is machine parsable, which allows potential new explorations in the fields of artificial intelligence and machine translation.
  • Lojban has a live community of speakers expanding its vocabulary day by day.
  • Lojban is designed aiming at being neutral between cultures.

Lojban means different things to different people

  • a linguistic curiosity - a test-bed for language experimentation
  • a challenging way to expand their minds or discipline their thoughts
  • a new perspective on languages
  • an entertaining medium to communicate with friends or create art
  • a domain for exploring the intersection of human language and software

What will Lojban mean for you?

More basic information ...

Learning Lojban

Unofficial and supplemental resources

«Lessons in Lojban» by Dustin Lacewell
«The Perfect Language», an introduction to Lojban by Wesley Wilson

Different non-authoritative learning resources have been created. They are said to be more beginner-friendly.

Official resources

  • "The Complete Lojban Language", a reference grammar of Lojban. This book will help those who already understand some Lojban. It's the most complete reference of Lojban language by far. It does not, however, teach vocabulary, style, or colloquial language. Please note that since the initial publication of the reference grammar, some language reforms such as xorlo have become widely adopted.


Related things

Software tools

  • Memrise.com offers on-line Lojban vocabulary flashcards. Anki is a downloadable alternative.
  • la camxes is an automatic grammar of Lojban. It can help you to understand the structure and correctness of sentences.
  • A Lojban-to-English translator. It is not precise, it can sometimes fail to correctly translate from English to Lojban or vice versa. It can be used to get at least some understanding of how Lojban works.

Other learning materials ...

Connect with the community

«bripre jikca», a community literary vlog
«ba'o», a song by La Djemynai

Lojban is spoken by a vibrant community, producing literature, music, and art, and discussing questions about language and thought. The web comic xkcd said that, if you spoke Lojban, you'd have to speak with Lojbanists. That may not be such a bad thing!

Instant messaging (text chat)

Connecting quickly

To get connected to Lojban chat use any of the following methods (your and others' messages will be available in all of them no matter which method you use).

People involved in Lojban community usually read each day's backlog and will answer your questions within several hours and often even within minutes.


Using this method you will be able to read the history of the chat since the beginning of 2016.

  1. Install the free Telegram messenger on your Apple, Android or your desktop device
  2. join main Lojban chat groups by following these links:
  3. Ask questions on Lojban in ckule group, talk in or about Lojban in Lojban group and talk only in Lojban in jbosnu group.


Using this method you will be able to read the history of the chat for the last ~7 days or so.

  1. Open https://slaka.herokuapp.com Submit your email and get an invite to http://lojban.slack.com to your e-mail inbox.
  2. Open http://lojban.slack.com
  3. Ask questions on Lojban in #ckule channel, talk in or about Lojban in #lojban channel and talk only in Lojban in #jbosnu channel.

Direct web access

Using this method you will be able to see messages that are sent only while you are connected.

  1. Navigate to the web-based IRC client (Kiwi), choose a nickname you want yourself to be known as, and click "Start". Easy!
  2. Click on the channel you want (tabs on the top of the page), and type your text in the text bar at the bottom - the last line at the bottom of the chat page.
  3. Ask questions on Lojban in #ckule tab, talk in or about Lojban in #lojban tab and talk only in Lojban in #jbosnu tab.

You may alternately try other methods of connecting.

Mailing lists

Got a question about Lojban?
Ask the the lojban-beginners mailing list!

The lojban-beginners mailing list is for questions about learning and understanding Lojban. You can subscribe to the list by sending a question to lojban-beginners@googlegroups.com.

The general-purpose lojban mailing list, which covers anything else related to Lojban, was founded in 1989, and has about 500 subscribers. You can subscribe to it by sending an email to lojban@googlegroups.com.

Social media

Lojban has a presence on many of the most popular web sites: Facebook Logo Mini.svg Facebook, Google plus icon.svg Google+, reddit-12.png Reddit, quora.png Quora.

la jbotcan is an informal bulletin board which hosts images and discussions in Lojban and English.

International Contacts

an exposition by la guskant in Japanese
  Languages spoken
la selpa'i
English, German
la gleki
English, Russian
la ilmen
English, French
la tsani
English, French
la xorxes
English, Spanish
la guskant
English, French, Chinese, Japanese, Esperanto
la remod
English, Italian

Lojban around the world - other ways of communication ...

What's next?

  • Try your hand at translating into Lojban, or write your own original texts: Poetry, prose, blogs, tweets, etc.
  • Continue learning vocabulary using memorization software.
  • Help expand the dictionary by translating Lojban words into other languages, or coin new compound words and add them.

More info ...

This web site is dedicated to documenting Lojban and the activities of the Lojban-using community, and also serves as the official web site of the Logical Language Group (LLG), a non-profit organization founded in 1987 to promote the scientific study of the relationships between language, thought and human culture.

From Lojban news...

Community news

28 April 2016

- la guskant published la skaborfe'a, a protest song against Gleki's dictatorship and the egocentrism of a Lojban community.

30 January 2016

- la ponjboci'ogri published a free pdf file of the group book, of which the printed book was sold in November 2015. The first part contains description of Lojban in Japanese, and the second part contains original texts in Lojban by la cogas, la niftyg and la sidas.

January 2016

- Premiere of Progress, a contemporary music containing Lojban sentences composed by Erik Natanael Gustafsson, was held at the Academy of Music and Drama of University of Gothenburg.

On the Internet


Jenn Coke @jenncoke
I knew of #Esperanto's being a #ConstructedLanguage (1887) but I never knew...
jenncoke 2016-05-31 05:43:43
Dank @Dank_scriptor
mi djuno lo du'u so'i lo lojbo prenu ku prami lo si'o lo smaji la'a .i ku'i lo nu tavla fi lo nu tavla cu nunbebna .i cinmo lo ka cunso ui
Dank_scriptor 2016-05-31 02:43:47
Peter Garnett @number_one_twit
@conceptofzero okay the good news is that there's already a way to do this. the bad news is that we'd have to write in lojban
number_one_twit 2016-05-30 23:41:49

Google Groups: lojban

Re: [lojban] lo tcidu bende pe la nicte cadzu — 29moi lo spisa
ni'o lo pa moi kumfa poi ko'a nergau cu xamgu se gusni .i se ki'u bo sy zi facki gi'e pilno vau lo gusni cuxyvra .i le drata kalte cu ckire cusku .i le kumfa cu se vorme so'u da gi'e vasru lo serti...
selpa'i 2016-05-31 13:15:37
Re: [lojban] lo tcidu bende pe la nicte cadzu — 28moi lo spisa
ta'o mi pu jinvi lo nu zo .reitcel. srana lo nu reitce ju'i nai > re'o lo barda xekri karce .i sy cusku lu xu la .axmed. joi mi'o kalte li'u > .i la .deivid. no'u vy zo goi .i zo goi .i zo go...
la uakci 2016-05-31 09:08:28

GoogleGroups: lojban-beginners

Re: [lojban-beginners] List of Lojban words for its grammatical classes
selm'a o isn't a "base", though... it's the lujvo form of se cmavo . "cmavrza'o" is of a class we call "zi'evla" ("free word"), which are lojban short forms that resemble fu'ivla, but come from str...
Michael Turniansky 2016-05-27 15:05:56
Re: [lojban-beginners] List of Lojban words for its grammatical classes
Calling {cmavrza'o} a fu'ivla does seem odd to me too, but the words are clearly "borrowed" from Lojban. {cmavrza'o} = {cmavo} + {za'o}. It's not like {admine}, which is clearly borrowed from the s...
Andrew 2016-05-27 04:58:45

GoogleGroups: bpfk-list

Re: [bpfk] ma ka'e bridi
2016-05-30 18:27 GMT+03:00 guskant <gusni...@gmail.com>: > > > Le lundi 30 mai 2016 13:39:21 UTC, la gleki a écrit : >> >> >> i zo ce'o ji lo'u jo'u se li'e bo le'...
la gleki 2016-05-30 17:21:46
Re: [bpfk] ma ka'e bridi
i ro xai mapti lo terbri i la'e di'u se nibli la'e di'e i ma'i lo xorlo zo'u tu'a zo ce'o se jalge tu'a lo porsi ije lo porsi cu gunma i ta'o Le lundi 8 février 2016 01:27:47 UTC, guskant a écrit...
guskant 2016-05-30 15:27:21