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English definition of “octave”

octave

noun [C] uk   /ˈɒk.tɪv/ us    /ˈɑːk-/ specialized
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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