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An interval of twelve semitones spanning eight degrees of the diatonic scale, representing a doubling or halving in pitch frequency.
example
The melody jumps up an octave at the beginning, then later drops back down an octave.
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The pitch an octave higher than a given pitch.
example
The bass starts on a low E, and the tenor comes in on the octave.
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A coupler on an organ which allows the organist to sound the note an octave above the note of the key pressed (cf sub-octave)
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A poetic stanza consisting of eight lines; usually used as one part of a sonnet.
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The eighth defensive position, with the sword hand held at waist height, and the tip of the sword out straight at knee level.
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The day that is one week after a feast day in the Latin rite of the Catholic Church.
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An eight-day period beginning on a feast day in the Latin rite of the Catholic Church.
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An octonion.
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Any of a number of coherent-noise functions of differing frequency that are added together to form Perlin noise.
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The subjective vibration of a planet.