The Wikipedia makes heavy weather of Caucasian; making the word seems pretty much worthless. They get a bit nearer to making sense with White Man.
White Man ex Wiki
White people, rather than being a straightforward description of skin color, is a term denoting a specific set of ethnic groups and functions as a color metaphor for race.
The definition of "white person" differs according to geographical and historical context. Various social constructions of whiteness have had implications in terms of national identity, consanguinity, public policy, religion, population statistics, racial segregation, affirmative action, eugenics, racial marginalization and racial quotas. The concept has been applied with varying degrees of formality and internal consistency in disciplines including sociology, politics, genetics, biology, medicine, biomedicine, language, culture and law.
Is evasive the right word to use about this one?
Caucasian Race ex Wiki
Caucasian race (also Caucasoid) is the general physical type of some or all of the populations of Europe, North Africa, the Horn of Africa, Western Asia/Middle East, Asia Minor, Central Asia and South Asia. Historically, the term was used for many people from these regions, without regard necessarily to skin tone.
Does this advance our understanding? Not really; perhaps that is the point.