Definitions

1. noun

A group of seven consecutive notes, especially in music, beginning on any note and including that note.

“The song’s melody spanned three octaves.”

2. noun

A division of the scale of seven notes, especially in music, used as a unit of measurement.

“The musician adjusted the instrument to play in a different octave.”

3. noun

A unit of measurement for sound levels, equal to 10 times the logarithm of the ratio of the sound power to one picowatt.

“The decibel reading was 80 decibels, or 8 octaves.”

4. verb

To make or become one of a higher or lower pitch, especially in music.

“The singer’s voice had to octave to hit the high note.”