"Oscan is an extinct Indo-European language of southern Italy and a sister language to Latin and Umbrian. Oscan was spoken by a number of tribes, including the Samnites,[3] the Aurunci (Ausones), and the Sidicini. The latter two tribes were often grouped under the name "Osci". The Oscan group is part of the Osco-Umbrian or Sabellic family, and includes the Oscan language and three variants (Hernican, Marrucinian and Paelignian) known only from inscriptions left by the Hernici, Marrucini and Paeligni, minor tribes of eastern central Italy. The language was spoken from approximately 500 BC to AD 100

Rhotacism may reflect a pre-Latin Oscan influence, with the pronunciation of the d sound as an r sound (rhotacism) at the beginning of a word or between two vowels: e.g. doje (feminine) or duje (masculine), meaning "two", is pronounced, and often spelled, as roje/ruje; vedé ("to see") as veré, and often spelled so; also cadé/caré ("to fall") and Madonna/Maronna).

Another purported Oscan influence is the historical assimilation of the consonant cluster /nd/ as /nn/, pronounced [nː] (this is generally reflected in spelling more consistently: munno vs Italian mondo "world"; quanno vs Italian quando "when"), along with the development of /mb/ as /mm/~[mː] (tammuro vs Italian tamburo "drum"), also consistently reflected in spelling."