The Collaborative International Dictionary of English v.0.48:

Enact \En*act"\, v. t. [imp. & p. p. Enacted; p. pr. & vb. n.
   Enacting.]
   1. To decree; to establish by legal and authoritative act; to
      make into a law; especially, to perform the legislative
      act with reference to (a bill) which gives it the validity
      of law.
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   2. To act; to perform; to do; to effect. [Obs.]
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            The king enacts more wonders than a man. --Shak.
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   3. To act the part of; to represent; to play.
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            I did enact Julius Caesar.            --Shak.
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   Enacting clause, that clause of a bill which formally
      expresses the legislative sanction.
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The Collaborative International Dictionary of English v.0.48:

Enact \En*act"\, n.
   Purpose; determination. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

enact
    v 1: order by virtue of superior authority; decree; "The King
         ordained the persecution and expulsion of the Jews"; "the
         legislature enacted this law in 1985" [syn: ordain,
         enact]
    2: act out; represent or perform as if in a play; "She reenacted
       what had happened earlier that day" [syn: enact, reenact,
       act out]