fifteenth fifteenfold • fifteenthly · · · Info · Definitions · Synonyms · Characters · · fifteenth · · Text Latin · · Script 9 · · Length Definitions · · · (noun) position 15 in a countable series of things. · · Noun Definition 1 (adj) coming next after the fourteenth and just before the sixteenth in position. Synonyms: 15th. · · Adjective Definition 1 Synonyms · · · 15th · · Synonym 1 Characters · · e latin small letter e U+0065 f latin small letter f U+0066 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