Professional fictional language
From Langmaker
A professional fictional language is a language used in a work of professionally published fiction.*
Note: this category is distinct from fictional language, which is used here to denote a language used in unpublished or non-professionally published fiction.* In other words, a language may be listed under professional conlangs or under fictional conlangs but not both.
(* As opposed to the other meaning of fictional, meaning unreal. Obviously, most conlangs would be fictional in that sense of the word.)
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