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