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WordNet-Online 
 Definitions from WordNet
Noun half-brother has 1 sense 
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| Definitions from the WebTerm: Half-BrotherDescriptionA half-brother refers to a male sibling who shares only one biological parent with another individual. While they may have different mothers or fathers, they share a common parent, either the father or the mother. The term is used to denote a familial relationship that exists between two individuals related by blood, albeit only partially. Sample SentencesNoun (Family Relationship): 
 Noun (Informal, Popular): 
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