Meaning

noun a daughter of your brother or sister

originFrom Middle English nece (“niece, granddaughter”), from Old French nece (“niece, granddaughter”) (Modern French nièce (“niece”)) from Late Latin neptia, representing Latin neptis (“granddaughter”), from Proto-Indo-European *néptih₂ (“granddaughter, niece”). Doublet of nift.

Etymology from Wiktionary, CC BY-SA 3.0