Substrata (linguistics) in the context of "Last speaker of the Cornish language"

Language contact occurs when speakers of two or more languages or linguistic varieties interact with and influence each other. The study of language contact is called contact linguistics. Language contact can occur at language borders, between adstratum languages, or as the result of migration, with an intrusive language acting as either a superstratum or a substratum.

When speakers of different languages interact closely, it is typical for their languages to influence each other. Intensive language contact may result in language convergence or relexification. In some cases a new contact language may be created as a result of the influence, such as a pidgin, creole, or mixed language. In many other cases, contact between speakers occurs with smaller-scale lasting effects on the language; these may include the borrowing of loanwords, calques, or other types of linguistic material.

Ancient South Arabian (ASA; also known as Old South Arabian, Epigraphic South Arabian, Ṣayhadic, or Yemenite) is a group of four closely related extinct languages (Sabaean/Sabaic, Qatabanic, Hadramitic, Minaic) spoken in the far southern portion of the Arabian Peninsula. The earliest preserved records belonging to the group are dated to the beginning of the 1st millennium BCE. They were written in the Ancient South Arabian script.

There were a number of other Old South Arabian languages (e.g. Awsānian), of which very little evidence has survived, however. A set of possible surviving Sayhadic languages is attested in the Razihi language, Rijal Alma language, and Faifi language spoken in far north-west of Yemen and far south-west of Saudi Arabia, though these varieties of speech have both Arabic and Sayhadic features, and it is difficult to classify them as either Arabic dialects with a Sayhadic substratum, or Sayhadic languages that have been restructured under pressure of Arabic.

American Sign Language (ASL) developed in the United States, starting as a blend of local sign languages and French Sign Language (FSL). Local varieties have developed in many countries, but there is little research on which should be considered dialects of ASL (such as Bolivian Sign Language) and which have diverged to the point of being distinct languages (such as Malaysian Sign Language).

The following are sign language varieties of ASL in countries other than the US and Canada, languages based on ASL with substratum influence from local sign languages, and mixed languages in which ASL is a component. Distinction follow political boundaries, which may not correspond to linguistic boundaries.

Galician–Asturian or Eonavian (autonym: fala; Asturian: eonaviegu, gallego-asturianu; Galician: eonaviego, galego-asturiano) is a set of Romance dialects or falas whose linguistic dominion extends into the zone of Asturias between the Eo River and Navia River (or more specifically the Eo and the Frejulfe River). The dialects have been variously classified as the northeastern varieties of Galician, as a linguistic group of its own, or as a dialect of transition between Galician and Asturian, an opinion upheld by José Luis García Arias, the former president of the Academy of the Asturian Language (ALLA).

The set of dialects was traditionally included by linguists as Galician-Portuguese or Galician, with some traits of the neighbouring Astur-Leonese linguistic group. Now, however, there is a political-linguistic conflict on the identity of the language between those who prioritise the mixed identity and those that continue to prioritise the Galician substratum. Supporters of the former, mostly in Asturias, identify Eonavian as part of a dialect continuum between the Asturian and Galician languages or even a third language belonging to Portuguese-Galician group spoken only in that area. Supporters of the latter, mostly in Galicia, identify it as just Galician and want for it the same level of protection as Galician has in Castile and Leon, which protects the dialects of El Bierzo (of which the westernmost varieties are usually classified as Galician) in cooperation with the Galician government.Recently, the director of an exhaustive study by the University of Oviedo (ETLEN, a Linguistic Atlas of the Boundary between Galician-Portuguese and Asturleonese in Asturias) concluded that both proposals are true and compatible: that is, local varieties belong to the Galician-Portuguese domain and are part of the transitional varieties between this domain and Astur-Leonese.

The Agaw or Central Cushitic languages are Afro-Asiatic languages spoken by several groups in Ethiopia and, in one case, Eritrea. They form the main substratum influence on Amharic and other Ethiopian Semitic languages.