Adjective

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

Noun

1. A member of the Caucasian racial classification.
2. A native or inhabitant of the Caucasus.
3. A group of languages spoken in the Caucasus area.
4. (bartending) A humourous name for the White Russian, a cocktail consisting of coffee liqueur, vodka, and milk. Apparently originated with the 1998 film The Big Lebowski.