octave

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oc·tave / ˈäktəv; ˈäkˌtāv/ • n. 1. Mus. a series of eight notes occupying the interval between (and including) two notes, one having twice or half the frequency of vibration of the other. ∎  the interval between these two notes. ∎  each of the two notes at the extremes of this interval. ∎  these two notes sounding together. 2. a poem or stanza of eight lines; an octet. 3. the eighth day after a church festival, inclusive of the day of the festival. ∎  a period of eight days beginning with the day of such a festival. 4. Fencing the last of eight standard parrying positions.

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octave (eccl.) formerly pl., eighth day after a festival, period of eight days beginning with the festival XIV; (pros.) group of eight lines of verse XVI; (mus.) note eight diatonic degrees above a given note XVII; interval, or series of notes. between a note and its octave; (fencing) XVIII; group of eight XIX. — (O)F. octave, superseding semi-pop. oitieve, utave — L. octāva, fem. of octāvus eighth, f. octō EIGHT.
So octavo size of the page of a book for which the sheets are so folded that each leaf is one-eighth of a full sheet XVII, earlier in o. XVI ‘in an eighth’; abl. of L. octāvus. octet(te) (mus.) composition for eight instruments or voices; (pros.) group of eight lines. XIX. — It. ottetto, or its deriv. G. oktett; f. otto eight.

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octave. Interval of 8 notes, counting bottom and top notes. Notes an octave apart have same letter-names. Interval from, say, D to next D above is perfect octave; from D up to D♭ and from D up to D♯ are diminished and augmented octaves respectively. Also double octave, 2 octaves; at the octave, to be perf. octave higher than written; in octaves, to be perf. with each note doubled one or more octaves above or below.

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octave In music, the interval between any given note and another one that is exactly twice (or half) the frequency of the first and thus, acoustically, a perfect consonance. In Western music, it encompasses the eight notes of the diatonic scale.

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octave •active • captive •festive, restive •dative, native, stative •fictive • unitive • octave • costive •emotive, motive, votive •furtive • appraisive

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octave A cask for wine containing one‐eighth of a pipe, about 13 imperial gallons (59 L).

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Octave. The period of eight days beginning with a Christian feast (i.e. until the same day of the next week), during which it may continue to be celebrated.