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