1903, modern revival of Old English sibling, equivalent to sib + -ling. Compare Middle English sib, sibbe, German Sippe. The term apparently meant merely kin or relative until the 20th century when it was utilised in a way that aided the study of genetics, which led to its specialized use. For example, the OED has a 1903 citation in which "sibling" must be defined for those who don't know the intended meaning. Pronunciation
  • enPR: sĭbʹ-lĭng, IPA: /ˈsɪblɪŋ/

sibling (plural siblings)

  1. A person who shares a parent; one's brother or sister who one shares a parent with.
    None of my siblings are married yet.
  2. (comptheory) A node in a data structure that shares its parent with another node.
  3. (taxonomy) The most closely related species, or one of several most closely species when none can be determined to be more closely related.

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