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Definition of Niece
1. Noun. A daughter of your brother or sister.
Definition of Niece
1. n. A relative, in general; especially, a descendant, whether male or female; a granddaughter or a grandson.
Definition of Niece
1. a daughter of one's brother or sister [n -S]
Medical Definition of Niece
1. 1. A relative, in general; especially, a descendant, whether male or female; a granddaughter or a grandson. 2. A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law. Origin: OE. Nece, F. Niece, LL. Neptia, for L. Neptis a granddaughter, niece, akin to nepos. See Nephew. Source: Websters Dictionary (01 Mar 1998)