"nibling : (chiefly anthropology, rare, often in the plural) Used especially as a gender-neutral..."

“nibling : (chiefly anthropology, rare, often in the plural) Used especially as a gender-neutral term: the child of one’s sibling or sibling-in-law; one’s nephew or niece.
Today is International Non-binary People’s Day, which recognizes people who have a non-binary gender identity – one that is not exclusively female or male.”

- https://en.wiktionary.org/wiki/nibling#English

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