
Comparative linguistics (originally comparative philology) is a branch of historical linguistics that is concerned with comparing languages to establish their historical relatedness. Genetic relatedness implies a common origin or proto-language, and comparative linguistics aims to construct language families, to reconstruct proto-languages and spe...
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http://en.wikipedia.org/wiki/Comparative_linguistics

study of the relationships or correspondences between two or more languages and the techniques used to discover whether the languages have a common ... [13 related articles]
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http://www.britannica.com/eb/a-z/c/120

the study of the correspondences between languages that have a common origin.
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https://www.infoplease.com/dictionary/comparative-linguistics
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