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octave

noun [C]
 
 
/ˈɒk.tɪv/ US  /ˈɑːk-/ specialized

Definition

the distance between two musical notes that are eight notes apart: Her remarkable vocal range spanned three and a half octaves.Beats or lengths of musical notes
(Definition of octave noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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