1844, Henry Cockton, Sylvester Sound, the somnambulist, pages 203–204:
It has been said that— when I made the observation, that if they were not married they ought to be—I endeavoured to stab their reputation. Now, I'll prove that I endeavoured to do nothing of the sort. [...] I'll prove it by logic, and I defy all the mathematicians in the habitable globe to known it down. I'll prove it by the regular mathematical construction of the English language, and will any man tell me there's any constructed language in the universe more mathematically regular than that?
1855, Benjamin Humphrey Smart, Thought and language: an essay, having in view the revival, correction, and exclusive establishment of Locke's philosophy, Longman, Brown, Green, and Longmans, page 165:
Who does not understand, as single parts of speech, all the common combinations which serve to connect and carry on construction, such as in-consequence-of, on-this-account, [...], and the like? Indeed, we are entitled to say of ordinary common-place speakers, that as they scarcely use constructed language except in forms already existing, so, with them, each thought finds an immediate sign in some familiar sentence; but then, be it observed, the parts which compose the sign have ceased to be separately significant: the sentences so used have been brought back to the condition of original or natural language, that of exclamations, — they have ceased to be logical, by having become purely rhetorical.
1867, David King, The British harbinger, David King, page 384:
What we ordinarily term language is made up of vocal signs of an arbitrary character, with corresponding written signs. As general principles are recognized in the construction and arrangement of these signs, we see at once the reason that brutes have no artificial language — that is, no sign that are agreed upon as expressive of ideas. They do indeed have a natural language, made up of natural signs, cries, and motions, which vary in different tribes of animals; but artificial, that is, constructed language, is a wholly different thing, although it may incorporate into itself features from natural language. The parrot is indeed said to talk, but it is sheer imitation; and he never originates any language.
1875, Royal Anthropological Institute of Great Britain and Ireland, Archaeological Survey of India, Indian antiquary[1], volume 4, Popular Prakashan, page 337:
They have no separate constructed language, but possess a peculiar vocabulary of their own, which they are rather shy of imparting to any one else; and though I had sometimes imagined that I had got hold of peculiar words, I always found them in the end traceable to other languages.
1881, Chautauqua Institution, Chautauqua Literary, Scientific Circle, The Chautauquan[2], volume 1, M. Bailey, page 35:
In this course, as the constructed language is to be the direct object of study, books are introduced and the pupils are trained to read.
Leibinz corresponded with Jesuit missionaries to find out as much as possible about Chinese; and Descartes, the French philosopher-mathematician outlined a science for a constructed language in 1629...
1972, Maurice Marois, Man and computer: proceedings[4], S. Karger, page 120:
So if the constructed language is machine code, that is very fine, because the syntax (the grammar) is very simple and the meaning of each instruction can be verified [...]
1974, Enid Mumford, Harold Sackman, International Federation for Information Processing, Human choice and computers: proceedings of the IFIP Conference on Human Choice and Computers, Vienna, April 1-5, 1974[5], North-Holland Pub. Co., →ISBN, page 19:
Considering the versatility of natural language, it is indeed astonishing that constructed languages like algebra and programming languages were introduced and became successful.
1994, John Edwards, John R. Edwards, Multilingualism, Routledge, →ISBN, page 45:
There is little doubt that, foremost among constructed languages though it is, Esperanto has not — particularly in recent times — captured a sufficient amount of general attention to become the functioning worldwide auxiliary its proponents wish.
1995, C. K. Ogden, Psyche: An Annual General and Linguistic Psychology 1920-1952, C. K. Ogden, →ISBN, page 13:
Study courses of Esperanto and Ido have been broadcast. In the possibility of radio uses of a constructed language — and such experiments are proving successful — vast sums of money and untold social forces may be involved.
1997, Humphrey Tonkin, Esperanto, interlinguistics, and planned language, University Press of America, →ISBN, page 2:
First, we can classify them according to the origin or genesis of a language, thus: (1) artificial language, planned language, (2) natural language, popular language, ethnic language. [...] It is important to stress that many of these expressions have in effect become technical terms (e.g., artificial language [...]) and can be found in catalogues and encyclopedias. This does not mean that they lack ambiguity or are generally accepted. Other expressions (e.g., constructed language) cannot be regarded as technical terms, though we consider them for the sake of simplicity.
2003, Janis Bubenko, John Impagliazzo, Arne Sølvenberg, History of Nordic computing: IFIP WG9.7 First Working Conference on the History of Nordic Computing, シュプリンガー・ジャパン株式会社, →ISBN, page 297:
The instructions to a computer appear in lexical forms of some artificial, formally and carefully constructed language, a language never spoken, only written by a programmer, and read by him and the computer.
2004, Steven Roger Fischer, A history of language, Reaktion Books, →ISBN, page 180:
The first practical constructed language was the south-west German Pastor Schleyer's Volapük from 1879; its complicated grammar and irregular vocabulary made learning difficult, however. The most successfull has been Esperanto, devised by the Warsaw ophthalmologist Ludwig Zamenhof in 1887, that today can count some one million speakers.
2004, Steven Roger Fischer, A history of language, Reaktion Books, →ISBN, page 209:
But some other language might replace English on the Internet in future. A constructed language might be chosen by a regulatory body as an alternative (though this seems unlikely). Automatic computer translation might make the entire question of a prevailing natural language superfluous, leaving one's choice merely that of which programming language to use.
2008, Inc Icon Group International, Repeat: Webster's Quotations, Facts and Phrases[6], ICON Group International, →ISBN, page 587:
[...] Unas Language from the science fiction television series Stargate SG-1 is a simplistic constructed language that lends itself to quick, sharp sentences.
2010, Alex Scott, What Is Expression?: How a Formal Theory Can Clarify the Expressive Possibilities of Language, iUniverse, →ISBN, page 107:
Among the kinds of expressive vocabularies that a speaker or writer may employ are emotional, moral, religious, aesthetic, scientific, technical, logical, mathematical, natural language, and constructed language (such as programming language or indexing language) vocabularies.
1994, John Edwards, Multilingualism, Routledge, →ISBN, page 45:
One rough distinction seems to be between those who, while not necessarily wholly unsympathetic to the idea of constructed languages, nevertheless perceive fatal flaws, and those who see Esperantists (and other constructed-language apologists) more or less as cranks and faddists.
1994, A. W. Carus, Carnap and Twentieth-Century Thought, Cambridge University Press, →ISBN, page 281:
Between them is a grey area of interpolations within or extrapolations from the constructed-language system.
