GlottologGlottolog is a bibliographic database of the world's lesser-known languages, developed and maintained first at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany (between 2015 and 2020 at the Max Planck Institute for the Science of Human History in Jena, Germany). Its main curators include Harald Hammarström and Martin Haspelmath. Sebastian Nordhoff and Harald Hammarström created the Glottolog/Langdoc project in 2011. The creation of Glottolog was partly motivated by the lack of a comprehensive language bibliography, especially in Ethnologue.
Daughter languageIn historical linguistics, a daughter language, also known as descendant language, is a language descended from another language, its mother language, through a process of genetic descent. If more than one language has developed from the same proto-language, or 'mother language', those languages are said to be sister languages, members of the same language family. These concepts are linked to the tree model of language evolution, in which the relationships between languages are compared with those between members of a family tree.
Mediopassive voiceThe mediopassive voice is a grammatical voice that subsumes the meanings of both the middle voice and the passive voice. Languages of the Indo-European family (and many others) typically have two or three of the following voices: active, middle, and passive. "Mediopassive" may be used to describe a category that covers both the middle (or "medium") and the passive voice. In synchronic grammars, the mediopassive voice is often simply termed either "middle" (typical for grammars of e.g.
Thematic vowelIn Indo-European studies, a thematic vowel or theme vowel is the vowel or from ablaut placed before the ending of a Proto-Indo-European (PIE) word. Nouns, adjectives, and verbs in the Indo-European languages with this vowel are thematic, and those without it are athematic. Used more generally, a thematic vowel is any vowel found at the end of the stem of a word. Outside Indo-European, the term "thematic vowel" is also used in the grammar of Kartvelian languages (see Georgian verb paradigm for more information on thematic vowels).
Wave modelIn historical linguistics, the wave model or wave theory (German Wellentheorie) is a model of language change in which a new language feature (innovation) or a new combination of language features spreads from its region of origin, affecting a gradually expanding cluster of dialects. Dialect diffusion spreads from a given point of contact like waves on the water. The theory was intended as a substitute for the tree model, which did not seem to be able to explain the existence of some features, especially in the Germanic languages, by descent from a proto-language.
Conservative and innovative (linguistics)In linguistics, a conservative form, variety, or feature of a language is one that has changed relatively little across the language's history, or which is relatively resistant to change. It is the opposite of innovative, innovating, or advanced forms, varieties, or features, which have undergone relatively larger or more recent changes. Furthermore, an archaic form is not only chronologically old (and often conservative) but also rarely used anymore in the modern language, and an obsolete form has fallen out of use altogether.
