Jisho

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Noun
1. artificial language (e.g. Esperanto); constructed language; conlang
Noun
2. language for defining structures, logic, etc. (e.g. XML, HTML, etc.)Computing
Wikipedia definition
3. Constructed languageA planned or constructed language—known colloquially as a conlang—is a language whose phonology, grammar, and/or vocabulary has been consciously devised by an individual or group, instead of having evolved naturally. There are many possible reasons to create a constructed language: to ease human communication; to give fiction or an associated constructed world an added layer of realism; for linguistic experimentation; for artistic creation; and for language games.
Read “Constructed language” on English Wikipedia
Read “人工言語” on Japanese Wikipedia
Read “Constructed language” on DBpedia

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