octave

Japanese: オクターブ

〘noun〙 (octave) (from the Latin for eight) The eighth note of a diatonic scale consisting of seven notes. It also refers to the interval between an eighth note above (twice the frequency) and an eighth note below (half the frequency). It is also used figuratively to mean the tone of something. An eighth interval. ※Music Theory Beginners (1888)〈translated by Uchida Yaichi〉 "To measure the interval of a scale, start from the first note, <omitted> and the final note is the eighth note from the first note, so it is called an eighth note (octave) ." ※Constellations (1922)〈Arishima Takeo〉 "When Otake was gone, the tone of the room became, so to speak, one octave lower."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙 (octave) (ラテン語の八の意から) 七音からなる全音階の第八音。また、八度上（振動数が二倍）および八度下（振動数が二分の一）の音程の開きのことをいう。比喩的に物事の調子の意にもいう。八度音程。※楽典初歩（1888）〈内田彌一訳〉「音階の音程を計ふるには、其第一音よりす、〈略〉而して其最終の音は、此第一音より第八音に当るを以て、之を名けて八音(オクダブ)といふ」※星座（1922）〈有島武郎〉「おたけがゐなくなると部屋の調子が謂はば一オクターブ低くなった」

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