The Collaborative International Dictionary of English v.0.48:

Damnation \Dam*na"tion\, n. [F. damnation, L. damnatio, fr.
   damnare. See Damn.]
   1. The state of being damned; condemnation; openly expressed
      disapprobation.
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   2. (Theol.) Condemnation to everlasting punishment in the
      future state, or the punishment itself.
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            How can ye escape the damnation of hell? --Matt.
                                                  xxiii. 33.
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            Wickedness is sin, and sin is damnation. --Shak.
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   3. A sin deserving of everlasting punishment. [R.]
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            The deep damnation of his taking-off. --Shak.
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WordNet (r) 3.0 (2006):

damnation
    n 1: the act of damning
    2: the state of being condemned to eternal punishment in Hell
       [syn: damnation, eternal damnation]