octave /okˈtiv, -tāv/

1. A set of eight
2. The last day of eight beginning with a church festival
3. The eight days from a festival to its octave
4. An eighth, or an interval of twelve semitones (music)
5. A note or sound an eighth above (or below) another (music)
6. The range of notes or keys from any one to its octave (music)
7. An organ stop sounding an octave higher than the basic pitch
8. A cask containing the eighth part of a pipe of wine
9. An eight-lined stanza
10. The first eight lines of a sonnet
11. The eighth of eight basic parrying positions (fencing)

1. Consisting of eight (esp lines)
2. In octaves
3. Sounding an octave higher (music)

octāvˈal adjective

1. Relating to an octave
2. Based on the number eight

octave coupler noun (music)

A device in an organ whereby, when a key is struck, a second note is produced an octave higher than the basic pitch

ocˈtave-fluteˈ noun

The piccolo, an octave above the ordinary flute

great octave (music)

The bass octave, conventionally represented by capital letters, from C, on the second line below the bass stave, up

law of octaves

The relationship which arranges the elements in order of atomic weight and in groups of eight, with recurring similarity of properties

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