What does it mean if someone is caucasian?

A Characteristic of one of the traditional racial divisions of humankind, marked by fair to dark skin, straight to tightly curled hair, and light to very dark eyes, and originally inhabiting Europe, parts of North Africa, western Asia, and India: no longer in technical use.
The official definition for the Word Caucasian is "of or relating to one of the traditional divisions of humankind, covering a broad group of peoples from Europe, western Asia, and parts of India and North Africa."