ninetieth nineteenthly • ninety · · · Info · Definitions · Synonyms · Characters · · ninetieth · · Text Latin · · Script 9 · · Length Definitions · · · (noun) position 90 in a countable series of things. · · Noun Definition 1 (adj) the ordinal number of ninety in counting order. Synonyms: 90th. · · Adjective Definition 1 Synonyms · · · 90th · · Synonym 1 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E t latin small letter t U+0074