Definitions of performance:

• noun:   any recognized accomplishment

  Example: "They admired his performance under stress"

• noun:   the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it

  Example: "They criticised his performance as mayor"

• noun:   the act of presenting a play or a piece of music or other entertainment

  Example: "We congratulated him on his performance at the rehearsal"

• noun:   a dramatic or musical entertainment

  Example: "They listened to ten different performances"

• noun:   process or manner of functioning or operating

  Example: "They compared the cooking performance of each oven"