A measure of how well or poorly a particular subject is doing in an area. For example, how efficiently tasks are being completed based on the time, resources, and finances used.
Merriam-Webster Online Dictionary
performance (noun)1.
a) the execution of an action
b) something accomplished - deed feat
2.
the fulfillment of a claim, promise, or request - implementation
3.
a) the action of representing a character in a play
b) a public presentation or exhibition - a benefit performance
4.
a) the ability to - perform efficiency
b) the manner in which a mechanism - performs engine performance
5.
the manner of reacting to stimuli - behavior
6.
the linguistic behavior of an individual - parole , also the ability to speak a certain language - compare competence 3
Merriam-Webster Online Thesaurus
performance (noun)1.
a presentation of an artistic work (as a piece of music) from a particular point of view
SYNONYMS:
interpretation, performance, reading, rendition, versionRELATED WORDS:
adaptation, reworking, variation2.
the doing of an action
SYNONYMS:
accomplishment, achievement, discharge, enactment, execution, fulfillment ( fulfilment), implementation, performance, perpetration, prosecution, pursuanceRELATED WORDS:
dispatch, expedition; administration, direction, handling, management; application, operation, practice ( practise)Performance (Wikipedia)

A performance is an act or process of staging or presenting a play, concert, or other forms of entertainment. It is also defined as the action or process of carrying out or accomplishing an action, task, or function.
Performance (Wiktionary)
English
Alternative forms
- performaunce (obsolete)
Etymology
From Middle English parfourmaunce; equivalent to perform + -ance.
Pronunciation
- enPR: pər-fôrʹ-məns
- (Received Pronunciation) IPA(key): [pəˈfɔː.məns]
- (General American, Canada) IPA(key): [pɚˈfoɹ.məns]
- (General Australian, New Zealand) IPA(key): [pəˈfoː.məns]
- Hyphenation: per‧for‧mance
Noun
performance
... Read MoreEffectiveness, efficacy, success, potency, efficiency, productivity, output, capability, competence, proficiency, adeptness, skill, performance, capacity, potential, ability, power, functionality, utility, usefulness, value, merit, worth, benefit, advantage, gain, yield, result, outcome, accomplishment, achievement, fulfillment
