(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'.
校对:朱莉娅
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