The definition of caste is a system of hierarchical social classes, or a specific social class of people.
(noun)See caste in Webster's New World College Dictionary
noun
Origin: Fr < Port casta, breed, race, caste < L castus, pure, chaste, orig., cut off, separated, pp. of carere, to be cut off from < IE base *es-, to cut > MIr cess, spear
See caste in American Heritage Dictionary 4
noun
Origin:
Origin: Spanish casta, race
Origin: , and Portuguese casta, race, caste
Origin: , both from feminine of casto, pure
Origin: , from Latin castus; see kes- in Indo-European roots
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