stanza

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One of the divisions of a poem, composed of two or more lines usually characterized by a common pattern of meter, rhyme, and number of lines.

from The Century Dictionary.

• noun Pl. stanze (-ze). In architecture, an apartment or division in a building; a room or chamber: as, the stanze of Raphael in the Vatican.
• noun In versification, a series of lines arranged in a fixed order of sequence as regards their length, metrical form, or rimes, and constituting a typical group, or one of a number of similar groups, composing a poem or part of a poem.

from the GNU version of the Collaborative International Dictionary of English.

• noun A number of lines or verses forming a division of a song or poem, and agreeing in meter, rhyme, number of lines, etc., with other divisions; a part of a poem, ordinarily containing every variation of measure in that poem; a combination or arrangement of lines usually recurring, whether like or unlike, in measure.
• noun (Arch.) An apartment or division in a building; a room or chamber.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A unit of a poem, written or printed as a paragraph; equivalent to a verse.
• noun architecture An apartment or division in a building.
• noun computing A structural element in XML

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a fixed number of lines of verse forming a unit of a poem