What does "co-aunt" mean?

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.

What is a synonym for "co-aunt"?

Common synonyms include: co-sister-in-law.

Co-aunt

noun

noun ·Rare ·Advanced level

Definitions

Noun

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
"A few years ago, my sister and co-aunt Judy started flying [our niece and nephew] Violet and Dash down to California to spend a week with her"

Synonyms

All synonyms

co-sister-in-law

Example

More examples

"A few years ago, my sister and co-aunt Judy started flying [our niece and nephew] Violet and Dash down to California to spend a week with her"

Etymology

* co- + aunt

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.