A Performance

1. The act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action.
2. 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.
3. (art) A live show or concert.
4. The amount of useful work accomplished estimated in terms of time needed, resources used, etc.
5. (linguistics) The actual use of language in concrete situations by native speakers of a language, as opposed to the system of linguistic knowledge they possess (competence), cf. linguistic performance.

Usage notes

Adjectives often applied to "performance": high, poor, improved, superior, excellent, good, peak, top, optimal, low, economic, academic, financial, musical, human, environmental, vocal, cognitive, dynamic, organizational, historical, physical, social, mechanical, electrical, mental, macroeconomic.