半はん音おんはんおんFreq.FrequencyTop 50,000Meanings1nounsemitone; half stepmusicThe smallest interval in Western music; the distance between two adjacent keys on a piano.ピアノで、ミとファの間あいだは半はん音おんです。On the piano, the interval between E and F is a semitone.この曲きょくは半はん音おんずつ転てん調ちょうしていく。This piece modulates up by semitones.