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==Etymology==

==Etymology==

[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from Medieval Latin octava,  from [[Latin]], feminine of octavus eighth, from octo eight  

[https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from Medieval Latin octava,  from [[Latin]], feminine of octavus eighth, from octo eight  

*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]

*Date: [https://www.wikipedia.org/wiki/14th_Century 14th century]

==Definitions==

==Definitions==

*1 : an 8-day period of [[observances]] beginning with a festival day

*1 : an 8-day period of [[observances]] beginning with a festival day

*5 : a [[group]] of eight

*5 : a [[group]] of eight

==Description==

==Description==

In [[music]], an '''octave''' is the [http://en.wikipedia.org/wiki/Interval_(music) interval] between one musical [[pitch]] and another with half or double its [[frequency]]. The octave [[relationship]] is a [[natural]] [[phenomenon]] which has been referred to as the "basic [[miracle]] of [[music]]," the use of which is "common in most musical [[systems]]." It may be derived from the [http://en.wikipedia.org/wiki/Harmonic_series_(music) harmonic series] as the interval between the first and second harmonics.

In [[music]], an '''octave''' is the [https://en.wikipedia.org/wiki/Interval_(music) interval] between one musical [[pitch]] and another with half or double its [[frequency]]. The octave [[relationship]] is a [[natural]] [[phenomenon]] which has been referred to as the "basic [[miracle]] of [[music]]," the use of which is "common in most musical [[systems]]." It may be derived from the [https://en.wikipedia.org/wiki/Harmonic_series_(music) harmonic series] as the interval between the first and second harmonics.

The octave is occasionally referred to as a diapason.[2]

The octave is occasionally referred to as a diapason.[2]

The octave above an indicated [[note]] is sometimes abbreviated 8va, and the octave below 8vb. To emphasize that it is one of the perfect intervals, the octave is sometimes designated P8; the other [http://en.wikipedia.org/wiki/Perfect_interval perfect intervals], the unison, [http://en.wikipedia.org/wiki/Perfect_fourth perfect fourth], and [http://en.wikipedia.org/wiki/Perfect_fifth perfect fifth], are designated PU, P4, and P5.[http://en.wikipedia.org/wiki/Octave]

The octave above an indicated [[note]] is sometimes abbreviated 8va, and the octave below 8vb. To emphasize that it is one of the perfect intervals, the octave is sometimes designated P8; the other [https://en.wikipedia.org/wiki/Perfect_interval perfect intervals], the unison, [https://en.wikipedia.org/wiki/Perfect_fourth perfect fourth], and [https://en.wikipedia.org/wiki/Perfect_fifth perfect fifth], are designated PU, P4, and P5.[https://en.wikipedia.org/wiki/Octave]

[[Category: Music]]

[[Category: Music]]