(1):

(a.) Of or pertaining to the white races of mankind, of whom the people about Mount Caucasus were formerly taken as the type.

(2):

(a.) Of or pertaining to the Caucasus, a mountainous region between the Black and Caspian seas.

(3):

(n.) A member of any of the white races of mankind.

(4):

(n.) A native or inhabitant of the Caucasus, esp. a Circassian or Georgian.