Webster's English Dictionary

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performance

per.for.mance \p*(r)-'fo.r-m*n(t)s\ \-m*-.to-r-e-, -.to.r-\ n 1a: the 
   execution of an action  1b: something accomplished : DEED, FEAT  2: the 
   fulfillment of a claim, promise, or request : IMPLEMENTATION  3a: the 
   action of representing a character in a play  3b: a public presentation or 
   exhibition  4a: the ability to perform : EFFICIENCY  4b: the manner in 
   which a mechanism performs  5: the manner of reacting to stimuli : BEHAVIOR 
    - per.for.ma.to.ry aj