octave

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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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