semitone semitonally • semitonic · · · Info · Definitions · Synonyms · Characters · · semitone · · Text Latin · · Script 8 · · Length Definitions · · · (noun) the musical interval between adjacent keys on a keyboard instrument. Synonyms: half step. · · Noun Definition 1 Synonyms · · · half step · · Synonym 1 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074