one-quintillionth one-quarter • oner · · · Info · Definitions · Synonyms · Characters · · one-quintillionth · · Text Common · · Latin · · Scripts 17 · · Length 6 · · Syllables Definitions · · · (noun) one part in a quintillion equal parts. Synonyms: quintillionth. · · Noun Definition 1 Synonyms · · · quintillionth · · Synonym 1 Characters · · - hyphen-minus U+002D e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F q latin small letter q U+0071 t latin small letter t U+0074 u latin small letter u U+0075