natural language, tongue - a human written or spoken language used by a community; opposed to e.g. a computer language

Proto-Indo European, PIE - a prehistoric unrecorded language that was the ancestor of all Indo-European languages

Albanian - the Indo-European language spoken by the people of Albania

Armenian language, Armenian - the Indo-European language spoken predominantly in Armenia

Illyrian - a minor and almost extinct branch of the Indo-European languages; spoken along the Dalmatian coast

Thraco-Phrygian - an extinct branch of the Indo-European language family thought by some to be related to Armenian

Balto-Slavic, Balto-Slavic language, Balto-Slavonic - a family of Indo-European languages including the Slavic and Baltic languages

Germanic, Germanic language - a branch of the Indo-European family of languages; members that are spoken currently fall into two major groups: Scandinavian and West Germanic

Celtic, Celtic language - a branch of the Indo-European languages that (judging from inscriptions and place names) was spread widely over Europe in the pre-Christian era

Italic language, Italic - a branch of the Indo-European languages of which Latin is the chief representative

Tocharian - a branch of the Indo-European language family that originated in central Asia during the first millennium A.D.

Indo-Iranian, Indo-Iranian language - the branch of the Indo-European family of languages including the Indic and Iranian language groups

Anatolian, Anatolian language - an extinct branch of the Indo-European family of languages known from inscriptions and important in the reconstruction of Proto-Indo European

Greek, Hellenic, Hellenic language - the Hellenic branch of the Indo-European family of languages