The Collaborative International Dictionary of English v.0.48:

Perform \Per*form"\, v. t. [imp. & p. p. Performed; p. pr. &
   vb. n. Performing.] [OE. performen, parfourmen, parfournen,
   OF. parfornir, parfournir, to finish, complete; OF. & F. par
   (see Par) + fournir to finish, complete. The word has been
   influenced by form; cf. L. performare to form thoroughly. See
   Furnish.]
   1. To carry through; to bring to completion; to achieve; to
      accomplish; to execute; to do.
      [1913 Webster]

            I will cry unto God most high, unto God that
            performeth all things for me.         --Ps. lvii. 2.
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            Great force to perform what they did attempt. --Sir
                                                  P. Sidney.
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   2. To discharge; to fulfill; to act up to; as, to perform a
      duty; to perform a promise or a vow.
      [1913 Webster]

            To perform your father's will.        --Shak.
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   3. To represent; to act; to play; as in drama.
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            Perform a part thou hast not done before. --Shak.
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   Syn: To accomplish; do; act; transact; achieve; execute;
        discharge; fulfill; effect; complete; consummate. See
        Accomplish.
        [1913 Webster]

WordNet (r) 3.0 (2006):

performing
    n 1: the performance of a part or role in a drama [syn:
         acting, playing, playacting, performing]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "performing":
   acting, action, agency, aping, behavioral, buffoonery, business,
   characterization, conduct, direction, driving, dumb show,
   embodiment, enacting, enactment, execution, exercise, functional,
   functioning, gag, ham, hammy acting, handling, hoke, hokum,
   imitation, impersonation, inaction, incarnation, management,
   manipulation, masquerade, mimesis, mimicking, mimicry, miming,
   mummery, occupation, operancy, operating, operation, operational,
   overacting, pantomime, pantomiming, patter, performance,
   personation, personification, playacting, playing, portrayal,
   posing, practice, practicing, projection, representation,
   responsibility, running, serving, slapstick, stage business,
   stage directions, stage presence, steering, stunt, taking a role,
   work, working, workings