fifteen fifo • fifteen-pounder · · · Info · Definitions · Synonyms · Characters · · fifteen · · Text Latin · · Script 7 · · Length 2 · · Syllables Definitions · · · (noun) the cardinal number that is the sum of fourteen and one. Synonyms: 15, XV. · · Noun Definition 1 (adj) being one more than fourteen. Synonyms: 15, xv. · · Adjective Definition 1 Synonyms · · · 15 · · Synonym 1 xv · · Synonym 2 Characters · · e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 n latin small letter n U+006E t latin small letter t U+0074