illustriousness illustriously • illutate · · · Info · Definitions · Synonyms · Characters · · illustriousness · · Text Latin · · Script 15 · · Length Definitions · · · (noun) the property possessed by something or someone of outstanding importance or eminence. Synonyms: greatness. · · Noun Definition 1 Synonyms · · · greatness · · Synonym 1 Characters · · e latin small letter e U+0065 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 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075