GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Niece (nēs), n. [OE. nece, F. nièce, LL. neptia, for L. neptis a granddaughter, niece, akin to nepos. See Nephew.]
   1. A relative, in general; especially, a descendant, whether male or female; a granddaughter or a grandson. [Obs.]  B. Jonson. Wyclif. Shak.
   
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   2. Especially: A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law.  In modern English, this is the primary meaning.
   
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