performance

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

• noun The act of performing or the state of being performed.
• noun The act or style of performing a work or role before an audience.
• noun The way in which someone or something functions.
• noun A presentation, especially a theatrical one, before an audience.
• noun Something performed; an accomplishment.
• noun Linguistics One's actual use of language in actual situations.

from The Century Dictionary.

• noun The act of performing or the condition of being performed; execution or completion of anything; a doing: as, the performance of works or of an undertaking; the performance of duty.
• noun That which is performed or accomplished; action; deed; thing done; a piece of work.
• noun A musical, dramatic, or other entertainment; the acting of a play, execution of vocal or instrumental music, exhibition of skill, etc., especially at a place of amusement.
• noun Synonyms Accomplishment, achievement, consummation. See perform.
• noun Exploit, feat.
• noun Production.

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

• noun The act of performing; the carrying into execution or action; execution; achievement; accomplishment; representation by action.
• noun That which is performed or accomplished; a thing done or carried through; an achievement; a deed; an act; a feat; esp., an action of an elaborate or public character.

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

• noun The act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action; as, the performance of an undertaking of a duty.
• noun That which is performed or accomplished; a thing done or carried through; an achievement; a deed; an act; a feat; especially, an action of an elaborate or public character.
• noun A live show or concert.
• noun computer science The amount of useful work accomplished by a computer system compared to the time and resources used. Better Performance means more work accomplished in shorter time and/or using less resources

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

• noun the act of presenting a play or a piece of music or other entertainment
• noun any recognized accomplishment
• noun the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it
• noun a dramatic or musical entertainment
• noun process or manner of functioning or operating