Definitions
1.nounThe act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action."the performance of an undertaking or a duty"
2.nounThat 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.nounA live show or concert.
4.nounThe amount of useful work accomplished estimated in terms of time needed, resources used, etc."Better performance means more work accomplished in shorter time and/or using fewer resources."
5.nounThe 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. :w:linguistic performance.