sibling
Americannoun
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a brother or sister.
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Anthropology. a comember of a sib, a unilateral descent group thought to share kinship through a common ancestor.
adjective
noun
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a person's brother or sister
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( as modifier )
sibling rivalry
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any fellow member of a sib
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of sibling
before 1000; late Middle English: relative, Old English; see sib, -ling 1
Explanation
A sibling is your brother or sister. It's that simple. The word sibling once meant anyone who is related to you, but now it's reserved for children of the same parent or parents. It is a word that was once out of use but then brought back into English in the early 1900s as a useful word in anthropology. If you and your brother fight all of the time, your parents might call it sibling rivalry. You might just call him annoying and run from the room.
Vocabulary lists containing sibling
It's All in the Family
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Unit 3: Compelling Evidence
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Unit 2: Pivotal Words and Phrases
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Subtitled “The Loving, Messy Realities of Sibling Relationships,” Ms. Carr’s book operates as an extended prompt to the reader to appreciate the many manifestations of familial coevals.
From The Wall Street Journal • Jun. 9, 2026
Sibling relationships don’t develop in a straight line.
From MarketWatch • Nov. 27, 2025
Sibling MSPs Annabelle and Fergus Ewing, whose late mother Winnie Ewing won a fabled by-election victory for the party in 1967, are among them.
From BBC • Apr. 30, 2024
Sibling studies account for these confounding factors because siblings are exposed to similar environments.
From Scientific American • May 21, 2023
Sibling Treachery Closer to home, Cleopatra needed to be on guard for ruthless enemies within her own family.
From "Sterling Biographies®: Cleopatra: Egypt's Last and Greatest Queen" by Susan Blackaby
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
