finale

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

• noun The concluding part, especially of a musical composition.

from The Century Dictionary.

• noun In music: The concluding section of a piece in rondo form, or of an act of a dramatic work, like an opera, especially if so managed as to produce an impressive climax. Operatic finales are usually concerted pieces for several soloists and a chorus.
• noun The last piece on a program, as of a concert.
• noun The last part, piece, or scene in any public performance or exhibition; any concluding act or performance.

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

• noun (Mus.) The last movement of a symphony, sonata, concerto, or any instrumental composition.
• noun The last composition performed in any act of an opera.
• noun The closing part, piece, or scene in any public performance or exhibition.

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

• noun The grand end of something, especially a show or piece of music.
• noun narratology The chronological conclusion of a series of narrative works.

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

• noun the temporal end; the concluding time
• noun the concluding part of any performance
• noun the closing section of a musical composition