The traditional interpretation of the data is that both subgroups of the Indo-European language family are generally more closely related to each other than to the other Indo-European languages. That could imply that they are descended from a common ancestor, Proto-Italo-Celtic, which can be partly reconstructed by the comparative method ...
Hellenic is the branch of the Indo-European language family whose principal member is Greek. In most classifications, Hellenic consists of Greek alone, but some linguists use the term Hellenic to refer to a group consisting of Greek proper and other varieties thought to be related but different enough to be separate languages, either among ancient neighbouring languages or among modern ...