The Indo-European languages comprise a family of several hundred languages and dialects 449 according to the 2005 SIL estimate, about half (219) belonging to the Indo-Aryan sub-branch., including most of the major languages of Europe, as well as many spoken in Southwest Asia, Central Asia and South Asia. Contemporary languages in this family with more than 100 million native speakers each include Hindi, Spanish, English, Portuguese, Bengali, Russian, French, German and Punjabi. Numerous national or minority languages with fewer than 100 million native speakers also exist. Indo-European has the largest numbers of speakers of the recognised families of languages in the world today, with its languages spoken by approximately 3 billion native speakers.the Sino-Tibetan family of tongues has the second-largest number of speakers. The Indo-Iranian languages form the largest sub-branch of Indo-European.in terms of geography (stretching from the Caucasus to South India), as well as of variety (308 languages according to SIL) and of speakers (more than one billion).
The various subgroups of the Indo-European language family include (in historical order of their first attestation):
In addition to the classical ten branches listed above, several extinct and little-known languages have existed:
No doubt other Indo-European languages once existed which have now vanished without leaving a trace. Scholars cannot classify the fragmentary Raetian language with any certainty.
Specialists have postulated the existence of further subfamilies, among them Italo-Celtic and Graeco-Aryan. Neither of these has achieved wide acceptance. Indo-Hittite refers to the hypothesis that a significant separation occurred to split Anatolian from all the remaining groups.
Many scholars classify the Indo-European sub-branches into a Satem group and a Centum group. This terminology comes from the varying treatments of the three original velar rows. Satem languages lost the distinction between labiovelar and pure velar sounds, and at the same time assibilated the palatal velars. The centum languages, on the other hand, lost the distinction between palatal velars and pure velars. Geographically, the "eastern" languages belong in the Satem group: Indo-Iranian and Balto-Slavic (but not including Tocharian and Anatolian); and the "western" languages represent the Centum group: Germanic, Italic, and Celtic. The Satem-Centum isogloss runs right between the Greek (Centum) and Armenian (Satem) languages (which a number of scholars regard as closely related), with Greek exhibiting some marginal Satem features. Some scholars think that some languages classify neither as Satem nor as Centum (Anatolian, Tocharian, and possibly Albanian). Note that the grouping does not imply a claim of monophyly: we do not need to postulate the existence of a "proto-Centum" or of a "proto-Satem". Areal contact among already distinct post-PIE languages (say, during the 3rd millennium BC) may have spread the sound changes involved.
The hypothesis re-appeared in 1786 when Sir William Jones first lectured on similarities between four of the oldest languages known in his time: Latin, Greek, Sanskrit, and Persian. Systematic comparison of these and other old languages conducted by Franz Bopp supported this theory, and Bopp's Comparative Grammar, appearing between 1833 and 1852 counts as the starting-point of Indo-European studies as an academic discipline.
Marija Gimbutas originally suggested the Kurgan hypothesis in the 1950s. According to the Kurgan hypothesis, chalcolithic steppe cultures of the 5th millennium BC between the Black Sea and the Volga spoke early PIE.
Kurgan hypothesis timeline:
A strength of the Kurgan hypothesis lies in the fact that part of its proposed mode of spread (military conquest by horsemen) agrees with historical reports about the spread of early Greek and early Indo-Aryan peoples.
Colin Renfrew in 1987 suggested an association between the spread of Indo-European and the Neolithic revolution, spreading peacefully into Europe from Asia Minor (Anatolia) from around 7000 BC with the advance of farming (wave of advance). Accordingly, all the inhabitants of Neolithic Europe would have spoken Indo-European tongues, and the Kurgan migrations would at best have replaced Indo-European dialects with other Indo-European dialects.
According to Renfrew , the spread of Indo-European proceeded from "Pre-Proto-Indo-European" in 6500 to Archaic PIE in 5000 BC, with the historical Indo-European families developing from 3000 BC from "Balkan PIE".
The main strength of the farming hypothesis lies in its linking of the spread of Indo-European languages with an archeologically known event that likely involved major population shifts: the spread of farming (though the validity of basing a linguistics theory on archeological evidence remains disputed).
While the Anatolian theory enjoyed brief support when first proposed, the linguistic community in general now rejects it. While the spread of farming undisputedly constituted an important event, most see no case to connect it with Indo-Europeans in particular, seeing that terms for animal husbandry tend to have much better reconstructions than terms related to agriculture. The linguistic community further notes that linguistic evidence suggests a later date for Proto-Indo-European than the Anatolian theory predicts.
Some people have pointed to the Black Sea deluge theory, dating the genesis of the Sea of Azov to ca. 5600 BC, as a direct cause of Indo-European expansion. This event occurred in still clearly Neolithic times and happened rather too early to fit with Kurgan archaeology. One can still imagine it as an event in the remote past of the Sredny Stog culture, with the people living on the land now beneath the Sea of Azov as possible pre-Proto-Indo-Europeans.
Other theories exist, often with a nationalistic flavour, sometimes bordering on national mysticism, and typically positing the development in situ of their proponents' respective homes. For a prominent modern example of such, note the Indian theories that derive Vedic Sanskrit from the Indus valley civilization, postulating that Vedic Sanskrit essentially equates to Proto-Indo-European, and that all other dialects must ultimately trace back to the early Indus valley civilization of ca. 3000 BC (see Aryan Invasion Theory for a discussion). Various nationalistic European groups in the 19th and early 20th centuries espoused other theories along these lines. For example, a suggested location of the proto-language in Northern Europe became involved in justifying the view of the German people as "Aryan". For a modern version of the hypothesis of European origin of PIE see the Paleolithic Continuity Theory (proposed by Italian theorists) that derives Indo-European from the European Paleolithic cultures.
As the Proto-Indo-European language broke up, its sound system diverged as well, changing according to various sound laws evidenced in the daughter-languages. Notable cases of such sound laws include Grimm's law in Proto-Germanic, loss of prevocalic *p- in Proto-Celtic, loss of prevocalic *s- in Proto-Greek, Brugmann's law in Proto-Indo-Iranian, as well as satemization (discussed above). Grassmann's law and Bartholomae's law may or may not have operated at the common Indo-European stage.
Indo-Europese tale | Indogermanische Sprachfamilie | Indo-Europisc geþéodu | هندوأوروبية | Llingües indoeuropees | Индоевропейски езици | Індаэўрапейскія мовы | Indoevropski jezici | Yezhoù Europa | Llengües indoeuropees | Indoevropská jazyková rodina | Ieithoedd Indo-Ewropeaidd | Indoeuropæiske sprog | Indogermanische Sprachfamilie | Indoeuroopa keeled | Ινδοευρωπαϊκές γλώσσες | Lenguas indoeuropeas | Hindeŭropa lingvaro | زبانهای هندواروپایی | Indo-evropeisk mál | Langues indo-européennes | Yndo-Jeropeeske talen | Cine teangeolaíoch Ind-Eorpach | Linguas indoeuropeas | 인도유럽어족 | Indoeuropska jezična porodica | Indo-Europana linguaro | Bahasa Indo-Eropa | Lingue indoeuropee | שפות הודו-אירופיות | Yethow Eyndo-Europek | Zimanmalbata hind û ewropî | Linguae Indoeuropaeae | Indoeuropiečių kalbos | Indoeiropieši | xinjoiro'o bangu | Indoeurópai nyelvcsalád | Индоевропски јазици | Indo-Europese talen | Indoeuropääsche Spraken | インド・ヨーロッパ語族 | Indo-europeiske språk | Lengas indo-europèas | Języki indoeuropejskie | Línguas indo-européias | Limbile indo-europene | Индоевропейские языки | Indoeurohpálaš gielat | Indoevropski jeziki | Индоевропски језици | Indoeurooppalaiset kielet | Indoeuropeiska språk | ภาษากลุ่มอินโด-ยูโรเปียน | Hệ ngôn ngữ Ấn-Âu | Hint-Avrupa dil ailesi | Індоєвропейські мови | 印欧语系
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