noun

• The act of performing; carrying into execution or action; execution; achievement; accomplishment; representation by action.
• 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.
• (art) A live show or concert.
• The amount of useful work accomplished estimated in terms of time needed, resources used, etc.
• (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.