IPA: /ˈɒk.teɪv/
KK: /ˈɑkˌteɪv/
A set of eight lines in poetry or a series of eight items. It can also refer to a specific period in ecclesiastical contexts.
The poem begins with an octave that sets the tone for the rest of the piece.
Octave → It is formed from "octo" (meaning eight) and "-ave" (a suffix used in musical terminology). The word "octave" refers to the interval between one musical pitch and another with double its frequency, which is eight notes apart in the diatonic scale.
Think of the number 'eight' ('octo') to remember that an octave is the distance between two notes that are eight steps apart in music.