Definition of octave noun from the Oxford Advanced American Dictionary

 

octave

 noun
noun
NAmE//ˈɑktɪv//
 
(music)
 
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the difference (called theinterval) between the first and last notes in a series of eight notes on a scale to play an octave higher Orbison's vocal range spanned three octaves.
See the Oxford Advanced Learner's Dictionary entry: octave