Octave (disambiguation)
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An octave, in music, is the interval equivalent to an eighth.
Octave may also refer to
- a doubling or halving of frequency, in physics
- Octave (horse), a champion graded stakes race thoroughbred racehorse
- Octave (poetry), the first eight lines of a sonnet
- Sicilian octave, a distinct poetic form
- GNU Octave, a program for performing numerical analysis, mostly compatible with MATLAB
- Octave (liturgical), an eight day feast in the Catholic liturgical sense
- Ottava rima, an Italian verse form
- "The Law of Octaves" is a concept from the history of the development of the Periodic Table of Chemical Elements (see John Newlands or Mendeleev) and has nothing directly to do with music.
- an early term for octonion in algebra
- Octave (album), an album by The Moody Blues
- Operationally Critical Threat, Asset, and Vulnerability Evaluation (OCTAVE) risk management methodology by CERT
- Electromagnetic radiation can be divided into eighty-one octaves.