Literary language - Wikipedia
https://en.wikipedia.org/wiki/Literary_languageA literary language is the form of a language used in written literature, which can be either a nonstandard dialect or a standardized variety of the language. Literary language sometimes is noticeably different from the spoken language (lects), but the difference between literary language and non-literary language is greater in some languages; thus a great divergence between a written form and a spoken vernacular, the language exhibits diglossia, a community's uses two forms of …