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Loglan is a Logical language constructed language originally designed for linguistic research, particularly for investigating the Sapir–Whorf hypothesis. The language was developed beginning in 1955 by Dr. James Cooke Brown with the goal of making a language so different from natural languages that people learning it would think in a different way if the hypothesis were true. In 1960, Scientific American published an article introducing the language.Brown, James Cooke (1960). " Loglan". Scientific American 202:43–63. Loglan is the first among, and the main inspiration for, the languages known as logical languages, which also includes Lojban.
Brown founded The Loglan Institute (TLI) to develop the language and other applications of it. He always considered the language an incomplete research project, and although he released many publications about its design, he continued to claim legal restrictions on its use. Because of this, a group of his followers later formed the Logical Language Group to create the language Lojban along the same principles, but with the intention to make it freely available and encourage its use as a real language.
Supporters of Lojban use the term Loglan as a generic term to refer to both their own language and Brown's Loglan, referred to as " TLI Loglan" when in need of disambiguation. Although the non- of the term Loglan was eventually upheld by the United States Patent and Trademark Office, many supporters and members of The Loglan Institute find this usage offensive and reserve Loglan for the TLI version of the language.
Brown intended Loglan to be as culturally neutral as possible and metaphysically parsimonious, which means that obligatory categories are kept to a minimum. An example of an obligatory category in English language is the time-tense of , as it is impossible to express a finite verb without also expressing a tense.
Brown also intended the language to be completely regular and unambiguous. Each sentence can be parsed in only one way. Furthermore, the syllabic structure of words was designed so that a sequence of syllables can be separated into words in only one way, even if the word separation is not clear from pauses in speech. It has a small number of phonemes, so that regional "accents" are less likely to produce unintelligible speech. To make the vocabulary easier to learn, words were constructed to have elements in common with related words in the world's eight most widely spoken languages.
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The class of a word can be determined from its form. A predicate has always two or more syllables, the last syllable being of the form CV, and the other syllables being of the form CVC or CCV. Thus, possible predicates are "kanto", "stari", "simgroma", "nirpatretka", and so on. A structure word has always one or more syllables, each syllable being one of the four forms V, VV, CV, or CVV. Thus possible structure words are "e", "ai", "ga", "kia", "lemio", "inorau" and so on. A name may have any form but always ends with a consonant, which distinguishes names from other words, since predicates and structure words always end in a vowel. Names in Loglan are spelled in accordance with Loglan phonetics, so if the name comes from another language, the Loglan spelling may differ from the spelling in that language. If a name in its native language ends in a vowel, it is conventional to add an "s" to form the Loglan name; for example, the English name "Mary" is rendered in Loglan as "Meris" (pronounced /ˈmɛriːs/).
Certain structure words can be used to reorder the arguments of a predicate, to emphasize one of the arguments by putting it first. For example, "nu" swaps the first and second arguments of any predicate. So "T pa nu vedma S" means the same thing as "S pa vedma T" and might be translated "T was sold by S". Similarly, "fu" swaps the first and third argument, and "ju" swaps the first and fourth argument. Thus "B pa fu vedma T S" = "B bought T from S", and "P pa ju vedma T B" = "P was paid to buy T by B".
A name can be used as an argument by preceding it with the structure word "la". Thus "La Adam vedma" means "Adam sells". Unlike in English and many other languages, this structure word is required; an unadorned name cannot be used as an argument. (The sentence "Adam vedma" is an imperative meaning "Adam, sell (something)." In this case, the name is used as a vocative, not as an argument.)
A name, or any other word or phrase, can be explicitly quoted with the structure words "li" and "lu" to use the word itself, rather than the thing that word refers to, as an argument. Thus "Li Adam lu corta purda" means " Adam is a short word." Without the li/lu quotes, the sentence "La Adam corta purda" ("Adam is a short word") would claim that Adam, the person himself, is a short word.
A string of more than two predicates is left-associative. This grouping can be changed by using the structure word "ge", which groups what follows into a single unit. Thus Loglan can distinguish between the many possible meanings of the ambiguous English phrase "the pretty little girls' school", as in these examples:
Predicates can be modified to indicate the time at which something occurred (English tense) with the optional structure words "na" (present), "pa" (past) and "fa" (future). Thus "Le matma na vedma" means "The mother is (now) selling", while "Le matma fa vedma" means "The mother will sell". Marking the verb for tense is optional, so the word "ga" can be used when the time is not being specified. So "Le matma ga vedma" means "The mother sells (at some unspecified time in the past, present or future)".
Other logical connectives are based on the elementary connectives "e", "a" and "o", along with the negation word "no". For example, logical implication is indicated by the word "noa". The word is chosen to make it easy for a Loglan speaker to see that "A noa B" is logically equivalent to "no A a B". Brown argues that it is thus easier in Loglan than in English to see that two sentences like these are different ways of saying the same thing:
The conjunction "a" expresses the inclusive-or relation; that is, one of the two alternatives is true, or possibly both. The exclusive-or relation, in which only one of the alternatives is true, but not both, is expressed by a different word, "onoi". Again, the word is chosen to make clear the logical equivalence of "A o no B" and "A onoi B":
A special conjunction "ze" is used to create a "mixed" predicate which may be true even if it is not necessarily true for either of the component predicates. For example, "Le negda ga nigro ze blabi" means "The egg is black-and-white". This would be true if the egg were striped or speckled; in that case it would not be true that the egg is black nor that it is white. On the other hand, "Le negda ga nigro e blabi" would make the claim that "The egg is black and (it is also) white".
Loglan's inventor, James Cooke Brown, also wrote a utopian science fiction novel called The Troika Incident (1970) that uses Loglan phrases but calls the language a different name, "Panlan". 399 pages.
Loglan is used as the official interspecies language in the roleplaying game .
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