An octave is not a fifth. A fifth is any interval of exactly 7 half-steps. An octave is any interval of exactly 12 half-steps.
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I played an octave on the piano.
There is no antonym of octave. What could it refer to?
An octave is made up of notes spanning from A to G, from one A to the next A is an octave, and the word 'noat' is spelled 'note'.
The ratio is 2:1. The frequency doubles for each octave that you go up.
The bass starts on a low E, and the tenor comes in on the octave.