An octave is a verse form consisting of eight lines of iambic pentameter

Iambic pentameter

Iambic pentameter is a commonly used metrical line in traditional verse and verse drama. The term describes the particular rhythm that the words establish in that line. That rhythm is measured in small groups of syllables; these small groups of syllables are called "feet"...

 (in English) or of hendecasyllable

Hendecasyllable

The hendecasyllable is a line of eleven syllables, used in Ancient Greek and Latin quantitative verse as well as in medieval and modern European poetry.-In quantitative verse:...

s (in Italian). The most common rhyme scheme

Rhyme scheme

A rhyme scheme is the pattern of rhyme between lines of a poem or song. It is usually referred to by using letters to indicate which lines rhyme. In other words, it is the pattern of end rhymes or lines...

 for an octave is abba abba.

An octave is the first part of a Petrarchan sonnet, which ends with a contrasting sestet

Sestet

A sestet is the name given to the second division of an Italian sonnet , which must consist of an octave, of eight lines, succeeded by a sestet, of six lines. The first documented user of this poetical form was the Italian poet, Petrarch. In the usual course the rhymes are arranged abc abc, but...

. In traditional Italian sonnets the octave always ends with a conclusion of one idea, giving way to another idea in the sestet. Some English sonnets break that rule, often to striking effect. In Milton's Sonnet 19, the sestet begins early, halfway through the last line of the octave:

When I consider how my light is spent

Ere half my days in this dark world and wide,

And that one talent which is death to hide

Lodg'd with me useless, though my soul more bent

To serve therewith my Maker, and present

My true account, lest he returning chide,

"Doth God exact day-labour, light denied?"

I fondly ask. But Patience, to prevent

That murmur, soon replies: "God doth not need

Either man's work or his own gifts: who best

Bear his mild yoke, they serve him best. His state

Is kingly; thousands at his bidding speed

And post o'er land and ocean without rest:

They also serve who only stand and wait."

Patience's too-quick reply intrudes upon the integrity of the octave. Since "prevent" also means "anticipate," it is as if Patience is giving the answer before the question is finished.

Octaves are also used in the Petrarchan lover.

External links

• Poetic Form: Sonnet - Poets.org