niece
n. countablen. the daughter of your brother or sister. You also use this word for the daughter of your husband's or wife's brother or sister.
n. a female child of one's sibling or sibling-in-law. The male equivalent is 'nephew'.
My niece is starting primary school this September.
I am buying a birthday present for my niece, who turns ten next week.
Although they lived in different countries, she maintained a close relationship with her niece through weekly video calls and annual summer visits.
From 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.