Definition of "Caste" :
noun: in some social insects (such as ants) a physically distinct individual or group of individuals specialized to perform certain functions in the colony
noun: a social class separated from others by distinctions of hereditary rank or profession or wealth
noun: (Hinduism) a hereditary social class among Hindus; stratified according to ritual purity
noun: social status or position conferred by a system based on class
"Lose caste by doing work beneath one's station."