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( Language family)
A language family is a group of languages related by descent from a common ancestor, called the proto-language of that family. As with biological families, the evidence of relationship is observable shared characteristics. An accurately identified family is a phylogenetic unit; that is, all its members derive from a common ancestor, and all attested descendants of that ancestor are included in the family. Most of the world's languages are known to belong to language families. For the others, family relationships are not known or only tentatively proposed. The concept of language families is based on the assumption that over time languages gradually diverge into dialects and then into new languages. However, linguistic ancestry is less clear-cut than biological ancestry, because there are extreme cases of languages mixing due to language contact in conquest or trade, whereas biological species normally don't interbreed. In the formation of creole languages and other types of mixed languages, there may be no one ancestor of a given language. In addition, a number of sign languages have developed in isolation and may have no relatives at all. However, these cases are relatively rare and most languages can be unambiguously classified. The common ancestor of a language family is seldom known directly, since most languages have a relatively short recorded history. However, it is possible to recover many features of a proto-language by applying the comparative method—a reconstructive procedure worked out by 19th century linguist August Schleicher. This can demonstrate the validity of many of the proposed families in the list of language families. For example, the reconstructible common ancestor of the Indo-European language family is called Proto-Indo-European. Proto-Indo-European is not attested by written records, since it was spoken before the invention of writing.
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Language family Subcategories
Language family Articles
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