Knowledge representation language

The following list of notable constructed languages is divided into auxiliary, ritual, engineered, and artistic (including fictional) languages, and their respective subgenres.

International auxiliary languages are languages constructed to provide communication among all human beings, or a significant portion, without necessarily replacing native languages.

Controlled natural languages are natural languages that have been altered to make them simpler, easier to use, or more acceptable in certain circumstances, such as for use by people who do not speak the original language well. The following projects are examples of controlled English:

Visual languages use symbols or movements in place of the spoken word. Sign languages fall in this category.

These are languages (and scripts) in actual use by their communities or congregations.

Additionally, sketches of various other languages, such as Adûnaic, the Black Speech, Khuzdul, Telerin and Westron appear in his Middle-earth works alongside earlier draughts or imagined archaic forms of Elven languages such as Common Eldarin or Primitive Quendian, Goldogrin, and Ilkorin. Others such as Entish, Rohirric, and six languages of the Avari are mentioned but have only one or two words or phrases noted. For the film adaptation, linguist David Salo was hired to expand on Tolkien's languages where required for dialogue.

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