Octave
/ˈɑktɪv/
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Definition
(noun) An interval of twelve semitones spanning eight degrees of the diatonic scale, representing a doubling or halving in pitch frequency.
Sentence Examples
Certain pieces of music would be more melodious an octave higher.
There are eight notes in an octave.
CEFR Practice Quiz
The soprano effortlessly sang a full ____ above the written note during the final aria.