stanza, a division of a poem consisting of two or more lines arranged together as a unit. More specifically, a stanza usually is a group of lines arranged together in a recurring pattern of metrical lengths and a sequence of rhymes.
The structure of a stanza (also called a strophe or stave) is determined by the number of lines, the dominant metre, and the rhyme scheme. Thus, a stanza of four lines of iambic pentameter, rhyming abab, could be described as a quatrain.
Some of the most common stanzaic forms are designated by the number of lines in each unit—e.g., tercet or terza rima (three lines) and ottava rima (eight lines). Other forms are named for their inventors or best-known practitioners or for the work in which they first were heavily used—e.g., the Spenserian stanza, named for Edmund Spenser, or the In Memoriam stanza, popularized by Alfred, Lord Tennyson in the poem by that title. The term strophe is often used interchangeably with stanza, although strophe is sometimes used specifically to refer to a unit of a poem that does not have a regular metre and rhyme pattern or to a unit of a Pindaric ode.