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Indo-European is originally a linguistic term, referring to the Indo-European language family. By extension, it became a collective name for cultures and religions associated with these languages. Hypothetically, these cultures arose from the expansion of an ancient people, the Proto-Indo-Europeans, possibly originating from somewhere around the Black Sea region from the 5th millennium BC onward.
See main article Indo-European languages.
The Indo-European language family is attested in twelve branches, some of them extinct, with a historical distribution over most of Europe, Anatolia, Iran, Punjab and parts of Central Asia ( East Turkistan). During the age of colonialism, Indo-European languages spread from Europe to all continents, and today there are over three billion speakers of Indo-European languages, distributed over all the world.
The languages are traditionally separated into a Satem group in the east ( Balto-Slavic, Indo-Iranian, Armenian) and a CentumLinguistic typology Centum is the collective name for the branches of Indo-European in which the so-called Satem shift, the change of palato- velar k^, g^, g^h into fricatives or affricates, did not take place, and the palato-velar consonants merged with group in the west ( GreekThe Greek language ( /Elini'k{/) is an Indo-European language which has existed from around the 14th century BC in the Cretan inscriptions called Linear B. Mycenaean Greek of this period is distinguished from later Classical or Ancient Greek of the 8th ce, ItalicThe Italic subfamily is a member of the Centum branch of the Indo-European language group. Italic has two branches: Sabellic including: Oscan, spoken in the south-central region of the Italian peninsula Umbrian (not to be confused with the modern Umbrian, CelticCeltic languages are a branch of the Indo-European languages. They were spoken across western Europe in ancient times, but are now limited to a few enclaves in the British Isles and on the peninsula of Brittany in France. There are four main groups of Cel, GermanicThe Germanic languages form one of the branches of the Indo-European (IE) language family, spoken by the Germanic peoples who settled in northern Europe along the borders of the Roman Empire. They are characterised by a number of unique linguistic feature), according to their different treatment of PIE velar soundsVelars are consonants articulated with the back part of the tongue (the dorsum) against the soft palate (the back part of the roof of the mouth, known also as the velum . The velar consonants identified by the International Phonetic Alphabet are: Notes: #. The two groups are considered paraphyleticIn phylogenetics, a grouping of organisms is said to be paraphyletic if all the members of the group have a common ancestor but the group does not include all the descendants of the common ancestor. Groups which include all the descendants of a common anc, i.e. there are no separate proto-languageProto-language may either refer to a language that preceded a certain set of given languages, or to system of communication during a stage in glottogony that may not yet be properly called a language. Proto-language (relative): A language that reflects ans for each group and their common characteristics are likely due to prolongued contact because of their geographical proximity. Also, there is evidence that the Anatolian, Tocharian and Albanian branches belong to neither of the two groups.