performance
n. C / Un. the act of entertaining people by acting, singing, or playing music. It can also mean how well someone does a job or how well a machine works.
n. the execution of an artistic work before an audience; alternatively, the manner or efficiency with which a person or machine functions.
The band gave a great performance last night.
The manager reviewed her annual performance to decide if she deserved a promotion this year.
While the lead actor's performance was technically flawless, the production suffered from a lack of chemistry between the supporting cast members.
From Middle English parfourmaunce; equivalent to perform + -ance.
Countable when referring to a specific show or event; uncountable when referring to the general quality of work or operation.