1. a musical interval of eight notes, or the eighth note above or below a given note
Usage: music
2. the range of notes between two musical notes that are eight steps apart
Usage: music
3. a group or series of eight

Examples

• The soprano sang the melody an octave higher than written.
• His voice dropped a full octave during puberty.
• The piano has seven complete octaves plus a few extra keys.
• She could easily reach notes spanning two octaves.
• The choir sang in octaves to create a fuller sound.
• Middle C and the C above it are one octave apart.