Vedic Sanskrit
Vedic Sanskrit, also simply referred as the Vedic language, is the earliest attested form of Sanskrit, a language in the Indo-Aryan subgroup of the Indo-European language family. It is attested in the Vedas and related literature compiled over the period of the mid-2nd to mid-1st millennium BCE. It is orally preserved, predating the advent of writing by several centuries.
Extensive ancient literature in the Vedic Sanskrit language has survived into the modern era, and this has been a major source of information for reconstructing Proto-Indo-European and Proto-Indo-Iranian history.
Vedic Sanskrit has a number of linguistic features which are alien to most other Indo-European languages. Prominent examples include: phonologically, the introduction of retroflexes, which alternate with dentals, and morphologically, the formation of gerunds. Some philologists attribute such features, as well as the presence of non-Indo-European vocabulary, to a local substratum of languages encountered by Indo-Aryan peoples in Central Asia (Bactria-Marghiana) and within the Indian subcontinent during Indo-Aryan migrations, including the Dravidian languages.
Scholars have claimed to identify a substantial body of loanwords in the earliest Indian texts, including evidence of Non-Indo-Aryan elements (such as -sfollowing -uin Rigvedic busa). While some postulated loanwords are from Dravidian, and other forms are traceable to Munda or Proto-Burushaski, the bulk have no proven basis in any of the known families, suggesting a source in one or more lost languages. The discovery that some words taken to be loans from one of these lost sources had also been preserved in the earliest Iranian texts, and also in Tocharian, convinced Michael Witzel and Alexander Lubotsky that the source lay in Central Asia and could be associated with the Bactria–Margiana Archaeological Complex (BMAC). Another lost language is that of the Indus Valley civilization, which Witzel initially labelled Para-Munda, but later the Kubhā-Vipāś substrate.