Definition of "half-sibling" [half-sibling]

• The child of one's parent, but only one parent. (noun)

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• "But if it helps many more of its kin to survive, each of whom might carry some lesser portion of the same genetic code (a sibling has 1/2, a half-sibling, uncle or nephew has 1/4, and so on) then such altruism may have as much or more of an evolutionary advantage than if it just saved itself."
• "In this matter it is complicated by the father's infidelity, the revelation of a half-sibling, and the public nature of their family's troubles."
• "About 12 percent had at least one half-sibling, and 2 percent had a stepsibling."