Linguistic strata

extinct ancient language, spoken in pre-Roman times and into the Roman era by the Ligures, in what is now north-western Italy and south-eastern France (for the Romance language use Q36106)

unknown pre-Indo-European language(s) spoken in prehistoric Greece before the coming of the Proto-Greek language in the Greek peninsula during the Bronze Age

linguistic theory

Oldest reconstructed stratum of European hydronymy

language that influences, or is influenced by another through contact

hypothesis

aspect of Indo-Aryan language

hypothetical extinct Indo-European language, spoken in Belgica in late prehistory

occurrence of non-Indo-Aryan etymons in Vedic Sanskrit

disputed Pre-Indo-European language family

category of words in some Uralic languages