language isolate

Locations of a few examples of language isolates. A language isolate, sometimes called an isolated language, is a language that has no demonstrable genealogical relationship with any other language. That is, an isolate is a language family that only contains one member. Basque in Europe, Ainu (if counted as a single language) and Burushaski in Asia, Sandawe and Hadza in Africa, Haida and Zuni in North America, Kanoê and Trumai in South America, Tiwi and possibly Porome in Oceania are examples of language isolates, as too are well attested extinct languages such as Sumerian and Elamite. The exact number of language isolates is unknown due to insufficient data on several languages; that is, there is a fuzzy boundary between language isolates and unclassified languages. Researchers may have differing criteria on how much comparative work needs to be done before concluding that a language is an isolate.

"Isolate" does not mean that a language has no relatives, only that any relationships are too distant to be detectable. Most established families of oral languages – including isolates – are assumed to be related to each other at a time depth too great for us to reconstruct. (See linguistic monogenesis.)