grandniece grandness • grandpa · · · Info · Definitions · Synonyms · Characters · · grandniece · · Text Latin · · Script 10 · · Length Definitions · · · (noun) a daughter of your niece or nephew. Synonyms: great-niece. · · Noun Definition 1 Synonyms · · · great-niece · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072