An indigenous language, or autochthonous language, is a language that is native to a region and spoken by indigenous peoples. This language is from a linguistically distinct community that originated in the area. Indigenous languages are not necessarily national languages but they can be; for example, Aymara is an official language of Bolivia. Also, national languages are not necessarily indigenous to the country.
Many indigenous peoples worldwide have stopped passing on their ancestral languages to the next generation and have instead adopted the majority language as part of their acculturation into the majority culture. Furthermore, many indigenous languages have been subject to linguicide (language killing). Recognizing their vulnerability, the United Nations proclaimed 2019 the International Year of Indigenous Languages "to draw attention to the critical loss of indigenous languages and the urgent need to preserve, revitalize and promote indigenous languages."
Indigenous languages are disappearing for various reasons, including the mass extinction of entire speaker communities by natural disaster or genocide, aging communities in which the language is not passed on, and oppressive language planning policies that actively seek to eradicate languages.
In North America since 1600, at least 52 Native American languages have disappeared. There may be more than 7,000 languages that exist in the world today, though many of them have not been recorded because they belong to tribes in rural areas of the world or are not easily accessible. It is estimated that 6,809 "living" languages exist in the world today, with 90% having fewer than 100,000 speakers. That means that roughly 6,100 languages are facing a risk of eventual extinction. Some languages are very close to disappearing:
Forty six languages are known to have just one native speaker while 357 languages have fewer than 50 speakers. Rare languages are more likely to show evidence of decline than more common ones.
Oklahoma provides the backdrop for an example of language loss in the developed world.
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The United Nations Educational, Scientific and Cultural Organization (UNESCO) is a specialized agency of the United Nations (UN) aimed at promoting world peace and security through international cooperation in education, arts, sciences and culture. It has 194 member states and 12 associate members, as well as partners in the non-governmental, intergovernmental and private sector. Headquartered in Paris, France, UNESCO has 53 regional field offices and 199 national commissions that facilitate its global mandate.
Irish (Standard Irish: Gaeilge), also known as Gaelic 'geilIk, is a Goidelic language of the Insular Celtic branch of the Celtic language family, which is a part of the Indo-European language family. Irish is indigenous to the island of Ireland and was the population's first language until the 19th century, when English gradually became dominant, particularly in the last decades of the century. Today, Irish is still commonly spoken as a first language in areas of Ireland collectively known as the Gaeltacht, in which only 2% of Ireland's population lived in 2016.
A heritage language is a minority language (either immigrant or indigenous) learned by its speakers at home as children, and difficult to be fully developed because of insufficient input from the social environment. The speakers grow up with a different dominant language in which they become more competent. Polinsky and Kagan label it as a continuum (taken from Valdés definition of heritage language) that ranges from fluent speakers to barely speaking individuals of the home language.
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The Dependent Object Type (DOT) calculus was designed to put Scala on a sound basis, but while DOT relies on structural subtyping, Scala is a fundamentally class-based language. This impedance mismatch means that a proof of DOT soundness by itself is ...