• A person who shares a parent; one's brother or sister who one shares a parent with.
  • A node in a data structure that shares its parent with another node.
  • The most closely related species, or one of several most closely species when none can be determined to be more closely related.


  • 1903, modern revival of , 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 applied 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.{{cite-journal
  • |year=1903
  • |author=Karl Pearson
  • |authorlink=Karl Pearson
  • |author2=Alice Lee
  • |authorlink2=Alice Lee (mathematician)
  • |work=Biometrika
  • |title=On the laws of inheritance in man
  • |volume=2
  • |issue=4
  • |page=369
  • |pageurl=

Modern English dictionary

Explore and search massive catalog of over 900,000 word meanings.

Word of the Day

Get a curated memorable word every day.

Challenge yourself

Level up your vocabulary by setting personal goals.

And much more

Try out Vedaist now.