Octave na kiɗa yana nufin tazarar kiɗa tsakanin bayanin kula guda biyu inda mafi girman bayanin kula yana da ninki biyu na farar ƙaramin bayanin kula. Ma'ana, octave shine tazara tsakanin filin kiɗa ɗaya da wani mai rabi ko ninki biyu. Wannan tazara shine tushen tubalin ginin kiɗan Yamma kuma ana amfani dashi don ƙirƙirar waƙoƙi da jituwa. Kalmar “octave” ta fito ne daga kalmar Latin “octavus,” wanda ke nufin “na takwas,” tunda akwai rubutu guda takwas a ma’aunin diatonic, gami da bayanin farawa da octave.