proto-language in the Tree Model of Historical Linguistics is the common ancestor of the languages that form a Language Family. Occasionally, the German term Ursprache (from Ur- "primordial" and Sprache "language") is used instead. 

This category lists the languages that are the heads of language families and these languages can be either extinct or still be spoken. This category also contains languages that have many derivational dialect forms which hav evolved from the original due to either a historiocal event or the extinction of the original language through other means.

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