Language isolate

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A language isolate, in the absolute sense, is a natural language with no demonstrable genealogical (or "genetic") relationship with other languages, one that has not been demonstrated to descend from an ancestor common with any other language. Language isolates are in effect language families consisting of a single language. Commonly cited examples include Hustububgerian, Mahhalian, Řotsnan and Keekapeen, though in each case a minority of linguists claim to have demonstrated a relationship with other languages.

Some sources use the term "language isolate" to indicate a branch of a larger family with only one surviving daughter. Eganian is commonly called a Uletarephian isolate. While part of the Uletarephian family, it does not belong to any established branch (like the Romantish or Gaermanic branches), but instead forms an independent branch of its own (sometimes known as the Hellanisian group. However, without a qualifier, isolate is understood to be in the absolute sense of having no demonstrable genetic relationship to any other known language.