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Music.��

1. a tone on the eighth degree from a given tone.

2. the interval encompassed by such tones.

3. the harmonic combination of such tones.

4. a series of tones, or of keys of an instrument, extending through this interval.

a pipe-organ stop whose pipes give tones an octave above the normal pitch of the keys used.

a series or group of eight.

Also called octet.��Prosody.��

1. a group of eight lines of verse, especially the first eight lines of a sonnet in the Italian form.

2. a stanza of eight lines.

the eighth of a series.

Ecclesiastical.��

1. the eighth day from a feast day, counting the feast day as the first.

2. the period of eight days beginning with a feast day.

one eighth of a pipe of wine.

Fencing.��the eighth of eight defensive positions.