Niece (?), n. [OE. nece, F. niece, LL. neptia, for L. neptis a granddaughter, niece, akin to nepos. See Nephew.]
A relative, in general; especially, a descendant, whether male or female; a granddaughter or a grandson.
B. Jonson. Wyclif. Shak.
A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law.
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© Webster 1913.