co-aunt

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Noun

co-aunt (plural co-aunts)

1. of a woman, an aunt of one's niece or nephew who is not one's sister; a co-sister-in-law as common aunt to the children of two women's married siblings.
2. a woman's sister, as aunt in common to the children of a third sibling

Synonyms

• (sibling's spouse's sister) co-sister-in-law (relative to the married siblings rather than to the children; however, this term generally refers to a different relationship, that of two women who marry brothers)

Related terms

• co-grandmother

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