octave
nounThe interval of eight diatonic degrees between two tones of the same name, the higher of which has twice as many vibrations per second as the lower.
nounA tone that is eight diatonic degrees above or below another given tone.
nounTwo tones eight diatonic degrees apart that are sounded together.
nounThe consonance that results when two tones eight diatonic degrees apart are sounded.
nounA series of tones included within this interval or the keys of an instrument that produce such a series.
nounAn organ stop that produces tones an octave above those usually produced by the keys played.
nounThe interval between any two frequencies having a ratio of 2 to 1.
nounThe eighth day after a feast day, counting the feast day as one.