The Collaborative International Dictionary of English v.0.48:

Dilapidation \Di*lap`i*da"tion\, n. [L. dilapidatio: cf. F.
   dilapidation.]
   1. The act of dilapidating, or the state of being
      dilapidated, reduced to decay, partially ruined, or
      squandered.
      [1913 Webster]

            Tell the people that are relived by the dilapidation
            of their public estate.               --Burke.
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   2. Ecclesiastical waste; impairing of church property by an
      incumbent, through neglect or by intention.
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            The business of dilapidations came on between our
            bishop and the Archibishop of York.   --Strype.
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   3. (Law) The pulling down of a building, or suffering it to
      fall or be in a state of decay. --Burrill.
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WordNet (r) 3.0 (2006):

dilapidation
    n 1: a state of deterioration due to old age or long use [syn:
         decrepitude, dilapidation]
    2: the process of becoming dilapidated [syn: dilapidation,
       ruin]