The Celtic languages are a branch of the Indo-European language family, descended from Proto-Celtic. The term "Celtic" was first used to describe this language group by Edward Lhuyd in 1707, following Paul-Yves Pezron, who made the explicit link between the Celts described by classical writers and the Welsh and Breton languages.
In linguistics, the comparative method is a technique for studying the development of languages by performing a feature-by-feature comparison of two or more languages with common descent from a shared ancestor and then extrapolating backwards to infer the properties of that ancestor. The comparative method may be contrasted with the method of internal reconstruction in which the internal development of a single language is inferred by the analysis of features within that language. Ordinarily, both methods are used together to reconstruct prehistoric phases of languages; to fill in gaps in the historical record of a language; to discover the development of phonological, morphological and other linguistic systems and to confirm or to refute hypothesised relationships between languages.
The Indo-Iranian languages constitute the largest and southeasternmost extant branch of the Indo-European language family. They include over 300 languages, spoken by around 1.5 billion speakers, predominantly in South Asia, West Asia and parts of Central Asia.
The Indo-European languages are a language family native to the overwhelming majority of Europe, the Iranian plateau, and the northern Indian subcontinent. Some European languages of this family—English, French, Portuguese, Russian, Dutch, and Spanish—have expanded through colonialism in the modern period and are now spoken across several continents. The Indo-European family is divided into several branches or sub-families, of which there are eight groups with languages still alive today: Albanian, Armenian, Balto-Slavic, Celtic, Germanic, Hellenic, Indo-Iranian, and Italic; another nine subdivisions are now extinct.
A language family is a group of languages related through descent from a common ancestor, called the proto-language of that family. The term family is a metaphor borrowed from biology, with the tree model used in historical linguistics analogous to a family tree, or to phylogenetic trees of taxa used in evolutionary taxonomy. Linguists thus describe the daughter languages within a language family as being genetically related. The divergence of a proto-language into daughter languages typically occurs through geographical separation, with different regional dialects of the proto-language undergoing different language changes and thus becoming distinct languages over time.
Nostratic is a hypothetical language macrofamily including many of the language families of northern Eurasia first proposed in 1903. Though a historically important proposal, it is now generally considered a fringe theory. Its exact composition varies based on proponent; it typically includes the Kartvelian, Indo-European and Uralic languages; some languages from the similarly controversial Altaic family; the Afroasiatic languages; as well as the Dravidian languages.
Philology is the study of language in oral and written historical sources. It is the intersection of textual criticism, literary criticism, history, and linguistics with strong ties to etymology. Philology is also defined as the study of literary texts and oral and written records, the establishment of their authenticity and their original form, and the determination of their meaning. A person who pursues this kind of study is known as a philologist. In older usage, especially British, philology is more general, covering comparative and historical linguistics.
The Proto-Indo-Europeans are a hypothetical prehistoric ethnolinguistic group of Eurasia who spoke Proto-Indo-European (PIE), the reconstructed common ancestor of the Indo-European language family.
In historical linguistics, the homeland or Urheimat of a proto-language is the region in which it was spoken before splitting into different daughter languages. A proto-language is the reconstructed or historically-attested parent language of a group of languages that are genetically related.
The Thracian language is an extinct and poorly attested language, spoken in ancient times in Southeast Europe by the Thracians. The linguistic affinities of the Thracian language are poorly understood, but it is generally agreed that it was an Indo-European language.
Proto-Indo-European (PIE) is the reconstructed common ancestor of the Indo-European language family. No direct record of Proto-Indo-European exists; its proposed features have been derived by linguistic reconstruction from documented Indo-European languages.
The Dardic languages, or Hindu-Kush Indo-Aryan languages, are a group of several Indo-Aryan languages spoken in northern Pakistan, northwestern India and parts of northeastern Afghanistan. This region has sometimes been referred to as Dardistan.
The Balto-Slavic languages form a branch of the Indo-European family of languages, traditionally comprising the Baltic and Slavic languages. Baltic and Slavic languages share several linguistic traits not found in any other Indo-European branch, which points to a period of common development and origin.
Comparative linguistics is a branch of historical linguistics that is concerned with comparing languages to establish their historical relatedness.
In linguistic typology, active–stative alignment is a type of morphosyntactic alignment in which the sole argument ("subject") of an intransitive clause is sometimes marked in the same way as an agent of a transitive verb but other times in the same way as a direct object. Languages with active–stative alignment are often called active languages.
Winfred Philip Lehmann was an American linguist who specialized in historical, Germanic, and Indo-European linguistics. He was for many years a professor and head of departments for linguistics at the University of Texas at Austin, and served as president of both the Linguistic Society of America and the Modern Language Association. Lehmann was also a pioneer in machine translation. He lectured a large number of future scholars at Austin, and was the author of several influential works on linguistics.
The term Thraco-Illyrian refers to a hypothesis according to which the Daco-Thracian and Illyrian languages comprise a distinct branch of Indo-European. Thraco-Illyrian is also used as a term merely implying a Thracian-Illyrian interference, mixture or sprachbund, or as a shorthand way of saying that it is not determined whether a subject is to be considered as pertaining to Thracian or Illyrian. Downgraded to a geo-linguistic concept, these languages are referred to as Paleo-Balkan.
In the tree model of historical linguistics, a proto-language is a postulated ancestral language from which a number of attested languages are believed to have descended by evolution, forming a language family. Proto-languages are usually unattested, or partially attested at best. They are reconstructed by way of the comparative method.
In Indo-European studies, the salmon problem or salmon argument is an outdated argument in favour of placing the Indo-European urheimat in the Baltic region, as opposed to the Eurasian Steppe, based on the cognate etymology of the respective words for salmon in Germanic and Balto-Slavic languages. The word's wide distribution likely means it existed in its current form in a Proto-Indo-European language.
The North European hypothesis was a linguistic and archaeological theory that tried to explain the spread of the Indo-European languages in Europe and parts of Asia by locating the original homeland (Urheimat) in southern Scandinavia or in the North German Plain. This hypothesis, advanced by Karl Penka, Hermann Hirt, Gustaf Kossinna and others, had some success in the late 19th century and the early 20th century, and was endorsed by Nazism, but is today considered outdated by the majority of the academics, who tend to favor the Kurgan hypothesis.
