performance Definition

1a. The performing of a play, part, dance, piece of music, etc before an audience;
1b. A dramatic or artistic presentation or entertainment.

Thesaurus: production, play, show, presentation, exhibition.
2. The act or process of performing a task, etc.

Thesaurus: completion, fulfiment, fruition, achievement, accomplishment, realization, execution, doing, consummation.
3. A level of achievement, success or, in commerce, profitability.
4. Manner or efficiency of functioning.
5. derog
An instance of outrageous behaviour, especially in public.