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sibling

noun [C]
 
 
/ˈsɪb.lɪŋ/ formal

Definition

C2 a brother or sister: I have four siblings: three brothers and a sister. There was great sibling rivalry (= competition) between Peter and his brother.Family relations in general
(Definition of sibling noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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