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English definition of “stepbrother”

stepbrother

noun [C] uk   /ˈstepˌbrʌ.ðər/ us    /-ðɚ/
not your parents' son, but the son of a person that one of your parents has married
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Non-blood relations
(Definition of stepbrother from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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