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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