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1. The reciprocal state between individuals who have the same pair of parents. 2. All progeny of one pair of parents. [A.S. sib, relationship]
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sib·ship 'sib-.ship n a group of sibs <a small \sibship>
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sib·ship (sibґship) 1. relationship by blood. 2. a group of persons, all of whom are descendants of a common ancestor, commonly used as the basis of study to determine genetic influences. 3. a group of siblings.Medical dictionary. 2011.