1. adjective
a) Of, or relating to the Caucasus region or its people, languages and culture.
b) Of a human racial classification; pertaining to people having certain phenotypical features such as straight or wavy hair and very light to brown pigmented skin, and originating from Europe, parts of Northern Africa and Western, Central and South Asia.
2. noun
b) A member of the Caucasian racial classification.
Wikipedia foundation.