| Niece 1. (n.) A relative, in general; especially, a descendant, whether male or female; a granddaughter or a grandson. 2. (n.) A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law. Thesaurus Entries aunt, auntie, blood brother, brethren, brother, bub, bubba, bud, buddy, country cousin, cousin, cousin once removed, cousin twice removed, daughter, father, first cousin, foster brother, frater, grandnephew, grandniece, granduncle, great-aunt, great-uncle, half brother, kid brother, mother, nephew, nuncle, nunks, nunky, second cousin, sis, sissy, sister, sister-german, sistern, son, stepbrother, stepsister, unc, uncle, uncs, uterine brother |