ninety ninetieth • ninetyfold · · · Info · Definitions · Synonyms · Characters · · ninety · · Text Latin · · Script 6 · · Length Definitions · · · (noun) the cardinal number that is the product of ten and nine. Synonyms: 90, XC. · · Noun Definition 1 (adj) being ten more than eighty. Synonyms: 90, xc. · · Adjective Definition 1 Synonyms · · · 90 · · Synonym 1 xc · · Synonym 2 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E t latin small letter t U+0074 y latin small letter y U+0079