noun
chromatic scale
A music theory term referring to the scale consisting of all twelve semitones within an octave. Contrasts with 全音階 (diatonic scale).
See also: 全音階
半音階は、オクターブ内のすべての半音を含む音階です。
The chromatic scale is a scale that includes all semitones within an octave.
全音階 is the diatonic scale, which uses a pattern of whole and half steps, while 半音階 is the chromatic scale consisting entirely of half steps.
Compound of 半 (half) + 音階 (musical scale), literally 'half-step scale'.