The Indo-European languages include some 443 (SIL estimate) languages and dialects spoken by about three billion people, including most of the major language families of Europe and western Asia, which belong to a single superfamily. Contemporary languages in this superfamily include Persian, English, Spanish, Hindi, Bengali, Russian, Gujarati, Italian, Portuguese, French and German.
The possibility of common origin for these disparate tongues was first proposed by Sir William Jones, who noticed 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. In the 19th century, scholars used to call the group "Indo-Germanic languages" or sometimes "Aryan". However when it became apparent that the connection is relevant to most of Europe's languages, the name was expanded to Indo-European. An example of this was the strong similarity discovered between Sanskrit and older spoken dialects of Lithuanian.
The common ancestral (reconstructed) language is called Proto-Indo-European (PIE). There is disagreement as to the original geographic location (the so-called "Urheimat" or "original homeland"), where it originated from, with Armenia, the area to the north or west of the Black Sea, or Anatolia itself prime examples of proposed candidates.
- Anatolian languages — earliest attested branch, from the 18th century BC; extinct, most notable was the language of the Hittites.
- Indo-Iranian languages — including Sanskrit, attested from the 2nd millennium BC, Avestan and Persian.
- Greek language — fragmentary records in Mycenaean from the 14th century BC; well attested from ca. the 7th century BC.
- Italic languages — including Latin and its descendants, the Romance languages, attested from the 1st millennium BC.
- Celtic languages — Gaulish inscriptions date as early as the 6th century BC; Old Irish texts from the 6th century AD.
- Germanic languages (including English) — earliest testimonies in runic inscriptions from around the 2nd century, earliest coherent texts in Gothic, 4th century.
- Armenian language — attested from the 5th century.
- Tocharian languages — extinct tongues of the Tocharians, extant in two dialects, attested from roughly the 6th century.
- Balto-Slavic languages — including Baltic languages and Slavic languages, attested from the 6th century, earliest texts in Old Church Slavonic, 9th century.
- Albanian language — attested from the 16th century, sometimes placed with several extinct languages in the Illyrian languages subgroup.
- Phrygian language — extinct language of ancient Phrygia, fragmentary.
- Thracian language — extinct, fragmentary.
- Dacian language — extinct, fragmentary.
Non-IE European languages
Most spoken European languages belong to the Indo-European superfamily. There are, however, language families which do not. The Uralic language family, which includes Hungarian, Estonian, Finnish and the languages of the Sami, is an example. The Caucasian language family is another. The Basque language is unusual in that it does not appear to be related to any known living languages.
Some linguists propose that Indo-European languages are part of a hypothetical Nostratic language superfamily, and attempt to relate Indo-European to other language families, such as Caucasian languages, Altaic languages, Uralic languages, Dravidian languages, Afro-Asiatic languages. This theory is controversial, as is the similar Eurasiatic theory of Joseph H. Greenberg.
- Language families and languages
- August Schleicher, (A Compendium of the Comparative Grammar of the Indo-European Languages) (1861/62)
- List of Indo-European roots
- List of Indo-European languages
- The Evolution of the Indo-European Languages, by Dr. C. George Boeree .
- Indo-European Roots, from the American Heritage Dictionary .
- Indo-European Documentation Center at the University of Texas
- Say something in Proto-Indo-European (by Geoffrey Sampson )
- IE language family overview (SIL)
- Gray & Atkinson, article on PIE Phylogeny
- Indo-European Root/lemmas (by Andi Zeneli )