oc‧tave /ˈɒktɪv, -teɪv/ Pronunciation Key - Show Spelled Pronunciation[ok-tiv, -teyv] Pronunciation Key - Show IPA Pronunciation
–noun
1. Music.
a. a tone on the eighth degree from a given tone.
b. the interval encompassed by such tones.
c. the harmonic combination of such tones.
d. a series of tones, or of keys of an instrument, extending through this interval.
2. a pipe-organ stop whose pipes give tones an octave above the normal pitch of the keys used.
3. a series or group of eight.
4. Also called octet. Prosody.
a. a group of eight lines of verse, esp. the first eight lines of a sonnet in the Italian form. Compare sestet (def. 1).
b. a stanza of eight lines.
5. the eighth of a series.
6. Ecclesiastical.
a. the eighth day from a feast day, counting the feast day as the first.
b. the period of eight days beginning with a feast day.
7. one eighth of a pipe of wine.
8. Fencing. the eighth of eight defensive positions.
–adjective
9. pitched an octave higher.
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# The eighth tone above a given pitch, with twice as many vibrations per second, or below a given pitch, with half as many vibrations.
www.classic99.com/terms1b.htm
# Two frequencies are an octave apart if the ratio of the higher frequency to the lower frequency is two.
users.aol.com/inceusa/glossary.html
# The difference between two frequencies where one is twice the other. For example, 200 Hz is an octave higher than 100 Hz. 400 Hz is one octave higher than 200 Hz.
www.cinenow.com/us/lexique.php/i,O/
# A musical interval between two tones formed when the ratio between the frequencies of the tone is 21.
www.precisionautosound.net/glossary.html
# the audible frequency range is often divided into bands of frequencies because sound transmission through solid barriers can vary dramatically with the frequency of the sound. The broadest bandwidth commonly used is an octave. An octave is any band where the highest included frequency is exactly two times the lowest included frequency. For example, the frequency band that covers all frequencies between 707 Hz and 1,414 Hz is an octave band. ...
www.jglacoustics.com/acoustics-at_1.html
# An interval of 12 semitones or 6 whole steps
www.guitarlessonworld.com/resources/glossary.htm
# A doubling or halving, usually applied to frequency. A GAIN ROLL-OFF RATE of 6dB/octave defines a change of 6 dB for each doubling or halving of frequency. Note that 20 dB/decade is equivalent to 6 dB/octave.
www.freqdev.com/guide/Glossary_of_terms.html
# Eight notes, beginning and ending on the same letter name; double the frequency of vibration.
cinderella.nycopera.com/glossary.php
# parry #8; blade down and to the outside, wrist supinated.
www.wichitafencingacademy.org/fencing_glossary.html
# One full series of eight notes on the musical scale.
members.tripod.com/~rvbelzen/c128sg/glossary.htm
# The relationship between two pitches where one has a frequency of 2 times the other. Pitches in an octave equivelance have the same pitch class name, and when sounded together are perceived as the same pitch class.
www.smu.edu/totw/def.htm
# The eighth day after a feast (the feast day itself is counted).
www.history.ac.uk/cmh/gaz/glossary.html
# a frequency ratio of 2:1. A musical distance (interval) of 12 semitones.
www.cakewalk.com/tips/desktop-glossary.asp
# One of the pitch intervals in music. Physically, a note that is an octave higher than another has a frequency that is twice that of the lower one. [4]
www.keithyates.com/glossary.htm
# The frequency interval between two sounds whose frequency ration is 2.
www.macnoise.com/resources/glossary.htm
# A succession of eight notes comprising a scale, the eighth one having twice as many vibrations per second as the first.
www.bluebookofpianos.com/glossary.htm
# an interval of eight pitches, for example, from middle C to the C above
www.mso.com.au/edu/glossary/glossaryfull.asp
# the interval of an eighth
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# The span over which the frequency doubles; eg Middle C is 262 cycles per second; the C one octave above it is 524 cycles per second. The observed electromagnetic spectrum covers a range of 17 decades (about 56 octaves) - from about 10 6 to about 10 23 cycles per second.
www.angelfire.com/stars5/astroinfo/gloss/o.html
# A small barrel with a capacity varying between 54.5 litres and 81.8 litres (in general 63.6 litres ).
www.hintsandthings.co.uk/livingroom/glossaryNOP.htm
# an interval (eg C3 to C4) sometimes called the "perfect" 8th because of the simple 2 : 1 frequency ratio
hardnote.com/JumpHelp/glossary.htm
# A frequency band consisting of any starting frequency extending up to a frequency twice the starting frequency. In an electronic context it is used to describe a filter's behavior such as attenuating three dB per octave.
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# An interval of an 8 th , with the lower and upper notes having the same letter name.
www.harmonize.com/chinookwinds/terminologypg.htm
# Musically, octaves are 12 half steps apart. When listening to two notes that are an octave apart, there is a strong sense that the notes are the same. In fact, musicians refer to notes that are an octave apart by the same letter. Physically, octaves are multiples of the fundamental frequency For example, A2 is at 110 Hz (the 2 denotes octave number). A3 is located at 220 Hz, and A4 is at 440 Hz.
www.cs.hmc.edu/~kperdue/defs.html
# A range of frequencies between f and 2f, where f is an arbitrary base frequency.
www.howell1964.freeserve.co.uk/MSc/FIC/FIC_B.htm