diatonic scale
US /ˌdaɪ.əˈtɑːn.ɪk ˌskeɪl/
UK /ˌdaɪ.əˈtɑːn.ɪk ˌskeɪl/

1.
全音階
a seven-note musical scale that includes five whole steps and two half steps, commonly used in Western music
:
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Most Western music is based on the diatonic scale.
西洋音楽のほとんどは全音階に基づいています。
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The melody uses notes exclusively from the C major diatonic scale.
このメロディーはハ長調の全音階の音のみを使用しています。