The Conlang Flag, a symbol of language construction created by subscribers to the CONLANG mailing list, which represents the Tower of Babel against a rising sun.
A constructed language (sometimes called a conlang) is a language whose phonology, grammar, and vocabulary, instead of having developed naturally, are consciously devised for some purpose, which may include being devised for a work of fiction. A constructed language may also be referred to as an artificial, planned or invented language, or (in some cases) a fictional language. Planned languages (or engineered languages/engelangs) are languages that have been purposefully designed; they are the result of deliberate, controlling intervention and are thus of a form of language planning.
The expression planned language is sometimes used to indicate international auxiliary languages and other languages designed for actual use in human communication. Some prefer it to the adjective artificial, as this term may be perceived as pejorative. Outside Esperantoculture, the term language planning means the prescriptions given to a natural language to standardize it; in this regard, even a "natural language" may be artificial in some respects, meaning some of its words have been crafted by conscious decision. Prescriptive grammars, which date to ancient times for classical languages such as Latin and Sanskrit, are rule-based codifications of natural languages, such codifications being a middle ground between naïve natural selection and development of language and its explicit construction. The term glossopoeia is also used to mean language construction, particularly construction of artistic languages.
Novial was introduced in Jespersen's book An International Language in 1928. It was updated in his dictionary Novial Lexike in 1930, and further modifications were proposed in the 1930s, but the language became dormant with Jespersen's death in 1943. In the 1990s, with the revival of interest in constructed languages brought on by the Internet, some people rediscovered Novial.
Novial was first described in Jespersen’s book An International Language (1928). Part One of the book discusses the need for an IAL, the disadvantages of ethnic languages for that purpose, and common objections to constructed IALs. He also provides a critical overview of the history of constructed IALs with sections devoted to Volapük, Esperanto, Idiom Neutral, Ido, Latino sine Flexione and Occidental (Interlingue). The author makes it clear that he draws on a wealth of earlier work on the problem of a constructed IAL, not only the aforementioned IALs. Find out more...
Several articles about constructed languages have been deleted for lack of verifiability, independent resources or notability. If you think one of the following subjects meets Wikipedia's criteria for inclusion, don't hesitate dig it up from the graveyard, but don't forget to add proper references: