eighteen eight • eighteenfold · · · Info · Definitions · Synonyms · Characters · · eighteen · · Text Latin · · Script 8 · · Length Definitions · · · (noun) the cardinal number that is the sum of seventeen and one. Synonyms: 18, XVIII. · · Noun Definition 1 (adj) being one more than seventeen. Synonyms: 18, xviii. · · Adjective Definition 1 Synonyms · · · 18 · · Synonym 1 xviii · · Synonym 2 Characters · · e latin small letter e U+0065 g latin small letter g U+0067 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