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