Definitions from Wiktionary (octave)

▸ noun:  (music) An interval of twelve semitones spanning eight degrees of the diatonic scale, representing a doubling or halving in pitch frequency.
▸ noun:  (music) The pitch an octave higher than a given pitch.
▸ noun:  (music) 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)
▸ noun:  (poetry) A poetic stanza consisting of eight lines; usually used as one part of a sonnet.
▸ noun:  (fencing) The eighth defensive position, with the sword hand held at waist height, and the tip of the sword out straight at knee level.
▸ noun:  (Christianity) The day that is one week after a feast day in the Latin rite of the Catholic Church.
▸ noun:  (Christianity) An eight-day period beginning on a feast day in the Latin rite of the Catholic Church.
▸ noun:  A small cask of wine, one eighth of a pipe.
▸ noun:  (mathematics, obsolete) An octonion.
▸ noun:  (signal processing) Any of a number of coherent-noise functions of differing frequency that are added together to form Perlin noise.
▸ noun:  (astrology) The subjective vibration of a planet.
▸ adjective:  (obsolete) Consisting of eight; eight in number.
▸ verb:  Alternative form of octavate [(music) To sound one octave higher or lower.]

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