[seowulf]

Another definition of Caucasian is someone from the Caucasus region. On balance the evidence shows the earliest speakers of P-I-E were probably from the Caucasus.

The 19th century racial, i.e. skin color based, definition I agree should be scrapped. It makes much more sense to base a description of groups of human beings on language and common cultural and ethnic traits.

[Cronos]

19th century racial, i.e. skin color based,
well actually it's a bit deeper than that -- it is based more on physiognomy, not on skin color -- or else Southern Italians would be considered a different race from Nordics