Niece \Niece\, n. [OE. nece, F. ni[`e]ce, 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.

2. A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law.

Source: Webster's Revised Unabridged Dictionary (1913)