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n.
any recognized accomplishment; "they admired his performance under stress"; "when Roger Maris powered four home runs in one game his performance merits awe"
n.
the act of presenting a play or a piece of music or other entertainment; "we congratulated him on his performance at the rehearsal"; "an inspired performance of Mozart's C minor concerto"
n.
process or manner of functioning or operating; "the power of its engine determines its operation"; "the plane's operation in high winds"; "they compared the cooking performance of each oven"; "the jet's performance conformed to high standards"
n.
the act of transacting within or between groups (as carrying on commercial activities); "no transactions are possible without him"; "he has always been honest is his dealings with me"