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1 Music 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 the two notes at the extremes of an octave. each of the two notes at the extremes of an octave. the two notes at the extremes of an octave sounding together. 2a poem or stanza of eight lines; an octet.
3the eighth day after a church festival, inclusive of the day of the festival. a period of eight days beginning with the day of a church festival. 4 Fencing the last of eight standard parrying positions.