A 'written language' is the representation of a
language by means of a
writing system.
Written language is an
invention, in the sense that it must be taught to children, whereas
spoken language has evolved along with
homo sapiens. Children will instinctively learn or create spoken (or
gestural) languages.
Written language always appears as a complement to a specific natural language (
English,
French,
American Sign Language, etc.) and no purely written languages (with the exception of
computer languages, which are not natural languages) exist. Nevertheless many
extinct languages are in effect purely written, since the written form is all that survives.
Written languages often change much slower than the corresponding spoken languages. When one or more
registers of a language comes to be strongly divergent from spoken language, the resulting situation is called
diglossia. However, such diglossia is often considered as one between
literary language and other registers, especially if the
writing system reflects its
pronunciation.
Native readers and writers of English are often unaware that the complexities of English spelling make written English a somewhat artificial construct. The traditional spelling of English, at least for inherited words, preserves a late Middle English phonology that is no one's speech dialect; the artificial preservation of this much earlier form of the language in writing might make much of what we write intelligible to Chaucer, even if we could not understand his speech. Tom McArthur suggests that it is at least arguable that written and spoken English have reached the stage that can be considered diglossia.
See also
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List of writing systems
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Literary language
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List of languages by first written accounts
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Writing
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History of writing
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History of writing ancient numbers